diff --git a/SVSim.EmulatedEntrypoint/Controllers/LoadController.cs b/SVSim.EmulatedEntrypoint/Controllers/LoadController.cs
index cdd548a..3779b93 100644
--- a/SVSim.EmulatedEntrypoint/Controllers/LoadController.cs
+++ b/SVSim.EmulatedEntrypoint/Controllers/LoadController.cs
@@ -171,7 +171,6 @@ public class LoadController : SVSimController
                 MasterPoints = 0
             }).ToList(),
             ArenaConfig = new ArenaConfig(),
-            ArenaInfos = new List<ArenaInfo>(),
             RotationSets = rotationSets,
             UserConfig = new UserConfig(),
             OpenBattlefieldIds = (await _globalsRepository.GetBattlefields(true))
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaConfig.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaConfig.cs
index 2086f54..06f4bd5 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaConfig.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaConfig.cs
@@ -1,12 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class ArenaConfig
 {
+    [JsonPropertyName("use_challenge_two_pick_premium_card")]
     [Key("use_challenge_two_pick_premium_card")]
     public int UseChallengePickTwoPremiumCard { get; set; }
+    [JsonPropertyName("challenge_two_pick_sleeve_id")]
     [Key("challenge_two_pick_sleeve_id")]
     public int ChallengePickTwoCardSleeve { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaFormatInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaFormatInfo.cs
index 0a3a73a..dd38ce8 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaFormatInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaFormatInfo.cs
@@ -1,21 +1,28 @@
 using MessagePack;
 using SVSim.Database.Enums;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class ArenaFormatInfo
 {
+    [JsonPropertyName("two_pick_type")]
     [Key("two_pick_type")]
     public PickTwoFormat PickTwoFormat { get; set; }
+    [JsonPropertyName("card_pool_name")]
     [Key("card_pool_name")]
     public string CardPoolName { get; set; } = string.Empty;
+    [JsonPropertyName("announce_id")]
     [Key("announce_id")]
     public string AnnounceId { get; set; } = "0";
+    [JsonPropertyName("card_pool_url")]
     [Key("card_pool_url")]
     public string CardPoolUrl { get; set; } = string.Empty;
+    [JsonPropertyName("start_time")]
     [Key("start_time")]
     public DateTime StartTime { get; set; }
+    [JsonPropertyName("end_time")]
     [Key("end_time")]
     public DateTime EndTime { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaInfo.cs
index 5d84380..224d26c 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/ArenaInfo.cs
@@ -1,24 +1,33 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class ArenaInfo
 {
+    [JsonPropertyName("mode")]
     [Key("mode")]
     public int Mode { get; set; }
+    [JsonPropertyName("enable")]
     [Key("enable")]
     public int Enable { get; set; }
+    [JsonPropertyName("cost")]
     [Key("cost")]
     public ulong Cost { get; set; }
+    [JsonPropertyName("rupy_cost")]
     [Key("rupy_cost")]
     public ulong RupeeCost { get; set; }
+    [JsonPropertyName("ticket_cost")]
     [Key("ticket_cost")]
     public int TicketCost { get; set; }
+    [JsonPropertyName("is_join")]
     [Key("is_join")]
     public bool IsJoin { get; set; }
+    [JsonPropertyName("sales_period_info")]
     [Key("sales_period_info")]
     public ShopExpiryInfo? SalesPeriodInfo { get; set; }
+    [JsonPropertyName("format_info")]
     [Key("format_info")]
     public ArenaFormatInfo? FormatInfo { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarAbility.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarAbility.cs
index f29094e..36bf3b4 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarAbility.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarAbility.cs
@@ -1,26 +1,36 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class AvatarAbility
 {
+    [JsonPropertyName("leader_skin_id")]
     [Key("leader_skin_id")]
     public int LeaderSkinId { get; set; }
+    [JsonPropertyName("battle_start_firstplayerturn_bp")]
     [Key("battle_start_firstplayerturn_bp")]
     public int BattleStartFirstPlayerBp { get; set; }
+    [JsonPropertyName("battle_start_secondplayerturn_bp")]
     [Key("battle_start_secondplayerturn_bp")]
     public int BattleStartSecondPlayerBp { get; set; }
+    [JsonPropertyName("battle_start_max_life")]
     [Key("battle_start_max_life")]
     public int BattleStartMaxLife { get; set; }
+    [JsonPropertyName("ability_cost")]
     [Key("ability_cost")]
     public string AbilityCost { get; set; }
+    [JsonPropertyName("ability")]
     [Key("ability")]
     public string Ability { get; set; }
+    [JsonPropertyName("passive_ability")]
     [Key("passive_ability")]
     public string PassiveAbility { get; set; }
+    [JsonPropertyName("ability_desc")]
     [Key("ability_desc")]
     public string AbilityDesc { get; set; }
+    [JsonPropertyName("passive_ability_desc")]
     [Key("passive_ability_desc")]
     public string PassiveAbilityDesc { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarInfo.cs
index fe9717c..64ee6cc 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/AvatarInfo.cs
@@ -1,12 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class AvatarInfo
 {
+    [JsonPropertyName("abilities")]
     [Key("abilities")]
     public Dictionary<string, AvatarAbility> Abilities { get; set; } = new Dictionary<string, AvatarAbility>();
+    [JsonPropertyName("schedules")]
     [Key("schedules")]
     public SpecialRotationSchedule Schedules { get; set; } = new SpecialRotationSchedule();
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/BattlePassLevel.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/BattlePassLevel.cs
index da1ee16..23a1c00 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/BattlePassLevel.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/BattlePassLevel.cs
@@ -1,12 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class BattlePassLevel
 {
+    [JsonPropertyName("level")]
     [Key("level")]
     public int Level { get; set; }
+    [JsonPropertyName("required_point")]
     [Key("required_point")]
     public int RequiredPoints { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/CardIdentifier.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/CardIdentifier.cs
index c34f054..029ff75 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/CardIdentifier.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/CardIdentifier.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -11,6 +12,7 @@ public class CardIdentifier
     /// <summary>
     /// The identifier of the card.
     /// </summary>
+    [JsonPropertyName("card_id")]
     [Key("card_id")]
     public long CardId { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/CardSetIdentifier.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/CardSetIdentifier.cs
index f935ede..12ee7b7 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/CardSetIdentifier.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/CardSetIdentifier.cs
@@ -1,10 +1,12 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class CardSetIdentifier
 {
+    [JsonPropertyName("card_set_id")]
     [Key("card_set_id")]
     public int SetId { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/ClassExp.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/ClassExp.cs
index a725427..668f6df 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/ClassExp.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/ClassExp.cs
@@ -1,16 +1,21 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class ClassExp
 {
+    [JsonPropertyName("level")]
     [Key("level")]
     public int Level { get; set; }
+    [JsonPropertyName("necessary_exp")]
     [Key("necessary_exp")]
     public int NecessaryExp { get; set; }
+    [JsonPropertyName("diff_exp")]
     [Key("diff_exp")]
     public int DiffExp { get; set; }
+    [JsonPropertyName("accumulate_exp")]
     [Key("accumulate_exp")]
     public int AccumulateExp { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Common/EmptyResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Common/EmptyResponse.cs
index af0749e..4a03355 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Common/EmptyResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Common/EmptyResponse.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common;
 
@@ -10,5 +11,6 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common;
 [MessagePackObject]
 public class EmptyResponse
 {
+    [JsonPropertyName("_")]
     [Key("_")] public object? Reserved { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Common/Reward.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Common/Reward.cs
index d8b1026..f31bbd0 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Common/Reward.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Common/Reward.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common;
 
@@ -9,7 +10,10 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common;
 [MessagePackObject]
 public class Reward
 {
+    [JsonPropertyName("type")]
     [Key("type")] public int? Type { get; set; }
+    [JsonPropertyName("value")]
     [Key("value")] public long? Value { get; set; }
+    [JsonPropertyName("num")]
     [Key("num")] public int? Num { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/DailyLoginBonus.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/DailyLoginBonus.cs
index 5091ab0..b72e0eb 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/DailyLoginBonus.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/DailyLoginBonus.cs
@@ -1,14 +1,18 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class DailyLoginBonus
 {
+    [JsonPropertyName("total")]
     [Key("total")]
     public LoginBonusCampaign? Total { get; set; }
+    [JsonPropertyName("normal")]
     [Key("normal")]
     public LoginBonusCampaign? Normal { get; set; }
+    [JsonPropertyName("campaign")]
     [Key("campaign")]
     public LoginBonusCampaign? Campaign { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/DateRange.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/DateRange.cs
index 0ea9b9b..4abc7d9 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/DateRange.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/DateRange.cs
@@ -1,12 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class DateRange
 {
+    [JsonPropertyName("begin_time")]
     [Key("begin_time")]
     public DateTime BeginTime { get; set; }
+    [JsonPropertyName("end_time")]
     [Key("end_time")]
     public DateTime EndTime { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/DefaultSettings.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/DefaultSettings.cs
index 487e8dc..0af5aa9 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/DefaultSettings.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/DefaultSettings.cs
@@ -1,15 +1,19 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class DefaultSettings
 {
+    [JsonPropertyName("default_emblem_id")]
     [Key("default_emblem_id")]
     public int DefaultEmblemId { get; set; }
+    [JsonPropertyName("default_degree_id")]
     [Key("default_degree_id")]
     public int DefaultDegreeId { get; set; }
+    [JsonPropertyName("default_mypage_id")]
     [Key("default_mypage_id")]
     public int DefaultMyPageBackground { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/DegreeIdentifier.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/DegreeIdentifier.cs
index 0781558..4d5e1a7 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/DegreeIdentifier.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/DegreeIdentifier.cs
@@ -1,10 +1,12 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class DegreeIdentifier
 {
+    [JsonPropertyName("degree_id")]
     [Key("degree_id")]
     public int DegreeId { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/EmblemIdentifier.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/EmblemIdentifier.cs
index 2f37e1f..2440278 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/EmblemIdentifier.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/EmblemIdentifier.cs
@@ -1,10 +1,12 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class EmblemIdentifier
 {
+    [JsonPropertyName("emblem_id")]
     [Key("emblem_id")]
     public long EmblemId { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/GatheringInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/GatheringInfo.cs
index 74c5ac9..d8d4d27 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/GatheringInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/GatheringInfo.cs
@@ -1,10 +1,12 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class GatheringInfo
 {
+    [JsonPropertyName("has_invite")]
     [Key("has_invite")]
     public int HasInvite { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataHeaders.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataHeaders.cs
index 2135307..5cac025 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataHeaders.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataHeaders.cs
@@ -1,18 +1,24 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Internal;
 
 [MessagePackObject]
 public class DataHeaders
 {
+    [JsonPropertyName("short_udid")]
     [Key("short_udid")]
     public long ShortUdid { get; set; }
+    [JsonPropertyName("viewer_id")]
     [Key("viewer_id")]
     public long ViewerId { get; set; }
+    [JsonPropertyName("sid")]
     [Key("sid")]
     public string Sid { get; set; }
+    [JsonPropertyName("servertime")]
     [Key("servertime")]
     public long Servertime { get; set; }
+    [JsonPropertyName("result_code")]
     [Key("result_code")]
     public int ResultCode { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataWrapper.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataWrapper.cs
index 697ea74..150668c 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataWrapper.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataWrapper.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Internal;
 
@@ -11,12 +12,14 @@ public class DataWrapper
     /// <summary>
     /// Additional data about the request, response and user.
     /// </summary>
+    [JsonPropertyName("data_headers")]
     [Key("data_headers")] 
     public DataHeaders DataHeaders { get; set; } = new DataHeaders();
 
     /// <summary>
     /// The response data from the endpoint.
     /// </summary>
+    [JsonPropertyName("data")]
     [Key("data")] 
     public object Data { get; set; } = new();
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusCampaign.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusCampaign.cs
index 56d69bb..7a4aede 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusCampaign.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusCampaign.cs
@@ -1,20 +1,27 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class LoginBonusCampaign
 {
+    [JsonPropertyName("name")]
     [Key("name")]
     public string Name { get; set; } = string.Empty;
+    [JsonPropertyName("campaign_id")]
     [Key("campaign_id")]
     public int CampaignId { get; set; }
+    [JsonPropertyName("img")]
     [Key("img")]
     public int Image { get; set; }
+    [JsonPropertyName("now_count")]
     [Key("now_count")]
     public int NowCount { get; set; }
+    [JsonPropertyName("is_next_reward")]
     [Key("is_next_reward")]
     public bool IsNextReward { get; set; }
+    [JsonPropertyName("reward")]
     [Key("reward")]
     public List<LoginBonusReward> Rewards { get; set; } = new List<LoginBonusReward>();
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusReward.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusReward.cs
index d53d994..5e3c04d 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusReward.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/LoginBonusReward.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -8,24 +9,28 @@ public class LoginBonusReward
     /// <summary>
     /// The effect shown ingame.
     /// </summary>
+    [JsonPropertyName("effect_id")]
     [Key("effect_id")]
     public int EffectId { get; set; }
     
     /// <summary>
     /// The type of reward.
     /// </summary>
+    [JsonPropertyName("reward_type")]
     [Key("reward_type")]
     public int RewardType { get; set; }
     
     /// <summary>
     /// A more specified reward type (ie if a pack, which pack).
     /// </summary>
+    [JsonPropertyName("reward_detail_id")]
     [Key("reward_detail_id")]
     public int RewardDetailId { get; set; }
     
     /// <summary>
     /// The count of the reward.
     /// </summary>
+    [JsonPropertyName("reward_number")]
     [Key("reward_number")]
     public int RewardNumber { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/LootBoxRegulations.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/LootBoxRegulations.cs
index 414f111..6f56155 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/LootBoxRegulations.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/LootBoxRegulations.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -8,16 +9,22 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 [MessagePackObject]
 public class LootBoxRegulations
 {
+    [JsonPropertyName("pack")]
     [Key("pack")]
     public int Pack { get; set; }
+    [JsonPropertyName("arena_2pick")]
     [Key("arena_2pick")]
     public int ArenaPickTwo { get; set; }
+    [JsonPropertyName("arena_sealed")]
     [Key("arena_sealed")]
     public int ArenaSealed { get; set; }
+    [JsonPropertyName("arena_colosseum")]
     [Key("arena_colosseum")]
     public int ArenaColosseum { get; set; }
+    [JsonPropertyName("arena_competition")]
     [Key("arena_competition")]
     public int ArenaCompetition { get; set; }
+    [JsonPropertyName("special_shop")]
     [Key("special_shop")]
     public int SpecialShop { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationAbility.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationAbility.cs
index de051ca..907830f 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationAbility.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationAbility.cs
@@ -1,22 +1,30 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject()]
 public class MyRotationAbility
 {
+    [JsonPropertyName("ability_id")]
     [Key("ability_id")]
     public int AbilityId { get; set; }
+    [JsonPropertyName("add_start_pp")]
     [Key("add_start_pp")]
     public int AddStartPp { get; set; }
+    [JsonPropertyName("add_start_life")]
     [Key("add_start_life")]
     public int AddStartLife { get; set; }
+    [JsonPropertyName("increase_add_pptotal_amount")]
     [Key("increase_add_pptotal_amount")]
     public int IncreaseAddPpTotalAmount { get; set; }
+    [JsonPropertyName("increase_add_pptotal_turn")]
     [Key("increase_add_pptotal_turn")]
     public int IncreaseAddPpTotalTurn { get; set; }
+    [JsonPropertyName("ability")]
     [Key("ability")]
     public string Ability { get; set; } = string.Empty;
+    [JsonPropertyName("ability_desc")]
     [Key("ability_desc")]
     public string AbilityDesc { get; set; } = string.Empty;
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationInfo.cs
index 2578f45..a8e1d31 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/MyRotationInfo.cs
@@ -1,22 +1,28 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class MyRotationInfo
 {
+    [JsonPropertyName("abilities")]
     [Key("abilities")]
     public Dictionary<string, MyRotationAbility> Abilities { get; set; } = new Dictionary<string, MyRotationAbility>();
+    [JsonPropertyName("schedules")]
     [Key("schedules")]
     public SpecialRotationSchedule Schedules { get; set; } = new SpecialRotationSchedule();
+    [JsonPropertyName("setting")]
     [Key("setting")]
     public Dictionary<string, SpecialRotationSetting>? Settings { get; set; }
+    [JsonPropertyName("disabled_card_set_ids")]
     [Key("disabled_card_set_ids")]
     public List<int>? DisabledCardSets { get; set; }
     
     /// <summary>
     /// Set to card to card reprinted list.
     /// </summary>
+    [JsonPropertyName("reprinted_base_card_ids")]
     [Key("reprinted_base_card_ids")]
     public Dictionary<string, Dictionary<string, int>>? ReprintedCards { get; set; }
 
@@ -24,6 +30,7 @@ public class MyRotationInfo
     /// <summary>
     /// Set to card to count banlist.
     /// </summary>
+    [JsonPropertyName("restricted_base_card_id_list")]
     [Key("restricted_base_card_id_list")]
     public Dictionary<string, Dictionary<string, int>>? Banlist { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/PreReleaseInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/PreReleaseInfo.cs
index bc564b8..324121e 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/PreReleaseInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/PreReleaseInfo.cs
@@ -1,36 +1,51 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class PreReleaseInfo
 {
+    [JsonPropertyName("id")]
     [Key("id")]
     public int Id { get; set; }
+    [JsonPropertyName("start_time")]
     [Key("start_time")]
     public DateTime StartTime { get; set; }
+    [JsonPropertyName("end_time")]
     [Key("end_time")]
     public DateTime EndTime { get; set; }
+    [JsonPropertyName("display_end_time")]
     [Key("display_end_time")]
     public DateTime DisplayEndTime { get; set; }
+    [JsonPropertyName("next_card_set_id")]
     [Key("next_card_set_id")]
     public int NextCardSetId { get; set; }
+    [JsonPropertyName("default_card_master_id")]
     [Key("default_card_master_id")]
     public int DefaultCardMasterId { get; set; }
+    [JsonPropertyName("pre_release_card_master_id")]
     [Key("pre_release_card_master_id")]
     public int PreReleaseCardMasterId { get; set; }
+    [JsonPropertyName("free_match_start_time")]
     [Key("free_match_start_time")]
     public DateTime FreeMatchStartTime { get; set; }
+    [JsonPropertyName("card_master_id")]
     [Key("card_master_id")]
     public int CardMasterId { get; set; }
+    [JsonPropertyName("rotation_card_set_id_list")]
     [Key("rotation_card_set_id_list")]
     public List<int> RotationCardSets { get; set; } = new List<int>();
+    [JsonPropertyName("reprinted_base_card_ids")]
     [Key("reprinted_base_card_ids")]
     public Dictionary<string, long> ReprintedCardIds { get; set; } = new Dictionary<string, long>();
+    [JsonPropertyName("latest_reprinted_base_card_ids")]
     [Key("latest_reprinted_base_card_ids")]
     public List<int> LatestReprintedCardIds { get; set; } = new List<int>();
+    [JsonPropertyName("pre_release_status")]
     [Key("pre_release_status")]
     public int PreReleaseStatus { get; set; }
+    [JsonPropertyName("is_pre_rotation_free_match_term")]
     [Key("is_pre_rotation_free_match_term")]
     public int IsPreRotationFreeMatchTerm { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/RankInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/RankInfo.cs
index d387d7b..fbb91f2 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/RankInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/RankInfo.cs
@@ -1,43 +1,61 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class RankInfo
 {
+    [JsonPropertyName("rank_id")]
     [Key("rank_id")]
     public int RankId { get; set; }
+    [JsonPropertyName("rank_name")]
     [Key("rank_name")]
     public string RankName { get; set; } = string.Empty;
+    [JsonPropertyName("necessary_point")]
     [Key("necessary_point")]
     public int NecessaryPoints { get; set; }
+    [JsonPropertyName("accumulate_point")]
     [Key("accumulate_point")]
     public int AccumulatePoints { get; set; }
+    [JsonPropertyName("lower_limit_point")]
     [Key("lower_limit_point")]
     public int LowerLimitPoints { get; set; }
+    [JsonPropertyName("base_add_bp")]
     [Key("base_add_bp")]
     public int BaseAddBp { get; set; }
+    [JsonPropertyName("base_drop_bp")]
     [Key("base_drop_bp")]
     public int BaseDropBp { get; set; }
+    [JsonPropertyName("streak_bonus_pt")]
     [Key("streak_bonus_pt")]
     public int StreakBonusPoints { get; set; }
+    [JsonPropertyName("win_bonus")]
     [Key("win_bonus")]
     public double WinBonus { get; set; }
+    [JsonPropertyName("lose_bonus")]
     [Key("lose_bonus")]
     public double LoseBonus { get; set; }
+    [JsonPropertyName("max_win_bonus")]
     [Key("max_win_bonus")]
     public int MaxWinBonus { get; set; }
+    [JsonPropertyName("max_lose_bonus")]
     [Key("max_lose_bonus")]
     public int MaxLoseBonus { get; set; }
+    [JsonPropertyName("is_promotion_war")]
     [Key("is_promotion_war")]
     public int IsPromotionWar { get; set; }
+    [JsonPropertyName("match_count")]
     [Key("match_count")]
     public int MatchCount { get; set; }
+    [JsonPropertyName("necessary_win")]
     [Key("necessary_win")]
     public int NecessaryWins { get; set; }
+    [JsonPropertyName("reset_lose")]
     [Key("reset_lose")]
     public int ResetLose { get; set; }
+    [JsonPropertyName("accumulate_master_point")]
     [Key("accumulate_master_point")]
     public int AccumulateMasterPoints { get; set; }
     
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/RedEtherOverride.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/RedEtherOverride.cs
index 9397d0e..fec144f 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/RedEtherOverride.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/RedEtherOverride.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -11,18 +12,21 @@ public class RedEtherOverride
     /// <summary>
     /// The id of the affected card.
     /// </summary>
+    [JsonPropertyName("card_id")]
     [Key("card_id")]
     public ulong CardId { get; set; }
     
     /// <summary>
     /// How much red ether is now provided from dusting the card.
     /// </summary>
+    [JsonPropertyName("get_red_ether")]
     [Key("get_red_ether")]
     public int GetRedEther { get; set; }
     
     /// <summary>
     /// How much red ether is now required to craft the card.
     /// </summary>
+    [JsonPropertyName("use_red_ether")]
     [Key("use_red_ether")]
     public int UseRedEther { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BaseRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BaseRequest.cs
index e63c488..5e4d026 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BaseRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BaseRequest.cs
@@ -1,14 +1,18 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
 
 [MessagePackObject]
 public class BaseRequest
 {
+    [JsonPropertyName("viewer_id")]
     [Key("viewer_id")]
     public string ViewerId { get; set; }
+    [JsonPropertyName("steam_id")]
     [Key("steam_id")]
     public ulong SteamId { get; set; }
+    [JsonPropertyName("steam_session_ticket")]
     [Key("steam_session_ticket")]
     public string SteamSessionTicket { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Common/DeckFormatRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Common/DeckFormatRequest.cs
index b0a8719..17ca184 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Common/DeckFormatRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Common/DeckFormatRequest.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Common;
 
@@ -9,5 +10,6 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Common;
 [MessagePackObject]
 public class DeckFormatRequest : BaseRequest
 {
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckDeleteListRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckDeleteListRequest.cs
index dd34c4d..649fb2d 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckDeleteListRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckDeleteListRequest.cs
@@ -1,10 +1,13 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckDeleteListRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no_list")]
     [Key("deck_no_list")] public List<int>? DeckNoList { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckInfoRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckInfoRequest.cs
index 58e9933..f76e5cb 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckInfoRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckInfoRequest.cs
@@ -1,10 +1,11 @@
 using MessagePack;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Common;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 /// <summary>
-/// /deck/info — standard request is `DeckFormatRequest`. Copy-source overload adds
+/// /deck/info 窶・standard request is `DeckFormatRequest`. Copy-source overload adds
 /// `create_deck_format` (the format the user is creating the new deck IN). Server can
 /// ignore create_deck_format and return the standard shape; only matters for the
 /// cross-format deck-copy UI flow.
@@ -12,5 +13,6 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 [MessagePackObject]
 public class DeckInfoRequest : DeckFormatRequest
 {
+    [JsonPropertyName("create_deck_format")]
     [Key("create_deck_format")] public int? CreateDeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckOrderRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckOrderRequest.cs
index 5d92fe5..522a3f3 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckOrderRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckOrderRequest.cs
@@ -1,10 +1,13 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckOrderRequest : BaseRequest
 {
+    [JsonPropertyName("deck_order")]
     [Key("deck_order")] public List<int>? DeckOrder { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateLeaderSkinRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateLeaderSkinRequest.cs
index 1b719b4..ebb6d98 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateLeaderSkinRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateLeaderSkinRequest.cs
@@ -1,11 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckUpdateLeaderSkinRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("leader_skin_id")]
     [Key("leader_skin_id")] public int LeaderSkinId { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateNameRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateNameRequest.cs
index 3c962ed..d8533a9 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateNameRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateNameRequest.cs
@@ -1,11 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckUpdateNameRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("deck_name")]
     [Key("deck_name")] public string? DeckName { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRandomLeaderSkinRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRandomLeaderSkinRequest.cs
index 45bfd3a..09d4cc9 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRandomLeaderSkinRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRandomLeaderSkinRequest.cs
@@ -1,11 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckUpdateRandomLeaderSkinRequest : BaseRequest
 {
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("leader_skin_id_list")]
     [Key("leader_skin_id_list")] public List<int>? LeaderSkinIdList { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRequest.cs
index 90a5f77..82dfb2a 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateRequest.cs
@@ -1,27 +1,40 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckUpdateRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("class_id")]
     [Key("class_id")] public int ClassId { get; set; }
+    [JsonPropertyName("leader_skin_id")]
     [Key("leader_skin_id")] public int LeaderSkinId { get; set; }
+    [JsonPropertyName("is_random_leader_skin")]
     [Key("is_random_leader_skin")] public bool IsRandomLeaderSkin { get; set; }
+    [JsonPropertyName("leader_skin_id_list")]
     [Key("leader_skin_id_list")] public List<int>? LeaderSkinIdList { get; set; }
+    [JsonPropertyName("sleeve_id")]
     [Key("sleeve_id")] public long SleeveId { get; set; }
+    [JsonPropertyName("deck_name")]
     [Key("deck_name")] public string? DeckName { get; set; }
 
     /// <summary>0 = save the deck, 1 = delete this deck slot.</summary>
+    [JsonPropertyName("is_delete")]
     [Key("is_delete")] public int IsDelete { get; set; }
 
+    [JsonPropertyName("card_id_array")]
     [Key("card_id_array")] public List<long>? CardIdArray { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 
     /// <summary>MyRotation rule-set id (only when deck_format = MyRotation).</summary>
+    [JsonPropertyName("rotation_id")]
     [Key("rotation_id")] public string? RotationId { get; set; }
 
     /// <summary>Crossover sub-class id (only when deck_format = Crossover).</summary>
+    [JsonPropertyName("sub_class_id")]
     [Key("sub_class_id")] public int? SubClassId { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateSleeveRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateSleeveRequest.cs
index 5da755b..05d8324 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateSleeveRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/DeckUpdateSleeveRequest.cs
@@ -1,11 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class DeckUpdateSleeveRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("sleeve_id")]
     [Key("sleeve_id")] public long SleeveId { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/SetDeckRedisRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/SetDeckRedisRequest.cs
index 3ff85b6..bbbce4b 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/SetDeckRedisRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Deck/SetDeckRedisRequest.cs
@@ -1,10 +1,13 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Deck;
 
 [MessagePackObject]
 public class SetDeckRedisRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("class_id")]
     [Key("class_id")] public int ClassId { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/GameStartRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/GameStartRequest.cs
index 87d1c37..654aaef 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/GameStartRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/GameStartRequest.cs
@@ -1,16 +1,21 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
 
 [MessagePackObject]
 public class GameStartRequest : BaseRequest
 {
+    [JsonPropertyName("app_type")]
     [Key("app_type")]
     public int AppType { get; set; }
+    [JsonPropertyName("campaign_data")]
     [Key("campaign_data")]
     public string CampaignData { get; set; }
+    [JsonPropertyName("campaign_sign")]
     [Key("campaign_sign")]
     public string CampaignSign { get; set; }
+    [JsonPropertyName("campaign_user")]
     [Key("campaign_user")]
     public int CampaignUser { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/IndexRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/IndexRequest.cs
index 7a57aab..8cfb60f 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/IndexRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/IndexRequest.cs
@@ -1,13 +1,16 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
 
 [MessagePackObject]
 public class IndexRequest : BaseRequest
 {
+    [JsonPropertyName("carrier")]
     [Key("carrier")]
     public string Carrier { get; set; }
 
+    [JsonPropertyName("card_master_hash")]
     [Key("card_master_hash")]
     public string CardMasterHash { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Practice/PracticeFinishRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Practice/PracticeFinishRequest.cs
index 170f271..290ff63 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Practice/PracticeFinishRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Practice/PracticeFinishRequest.cs
@@ -1,30 +1,42 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Practice;
 
 [MessagePackObject]
 public class PracticeFinishRequest : BaseRequest
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")] public int DeckNo { get; set; }
+    [JsonPropertyName("is_win")]
     [Key("is_win")] public int IsWin { get; set; }
+    [JsonPropertyName("evolve_count")]
     [Key("evolve_count")] public int EvolveCount { get; set; }
+    [JsonPropertyName("total_turn")]
     [Key("total_turn")] public int TotalTurn { get; set; }
+    [JsonPropertyName("enemy_class_id")]
     [Key("enemy_class_id")] public int EnemyClassId { get; set; }
+    [JsonPropertyName("difficulty")]
     [Key("difficulty")] public int Difficulty { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")] public int DeckFormat { get; set; }
+    [JsonPropertyName("class_id")]
     [Key("class_id")] public int ClassId { get; set; }
 
+    [JsonPropertyName("mission")]
     [Key("mission")] public Dictionary<string, int>? Mission { get; set; }
 
     /// <summary>
-    /// JSON blob — `recovery_single.json` serialized to string. Always present; not validated
+    /// JSON blob 窶・`recovery_single.json` serialized to string. Always present; not validated
     /// server-side (audit-flagged as out of scope for v1).
     /// </summary>
+    [JsonPropertyName("recovery_data")]
     [Key("recovery_data")] public string? RecoveryData { get; set; }
 
     /// <summary>
-    /// Misspelled the same way in every solo finish endpoint — preserved on the wire.
+    /// Misspelled the same way in every solo finish endpoint 窶・preserved on the wire.
     /// See spec note on practice-finish.md.
     /// </summary>
+    [JsonPropertyName("prosessing_time_data")]
     [Key("prosessing_time_data")] public List<string>? ProsessingTimeData { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckListResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckListResponse.cs
index 8166de5..ab3ac23 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckListResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckListResponse.cs
@@ -1,15 +1,17 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
 
 /// <summary>
-/// Shape consumed by `DeckGroupListData(jsonData, format)` for a single-format call —
-/// the format-scoped decks land under `user_deck_list` (vs. the per-format keys used
+/// Shape consumed by `DeckGroupListData(jsonData, format)` for a single-format call 窶・/// the format-scoped decks land under `user_deck_list` (vs. the per-format keys used
 /// by /practice/deck_list with Format.All).
 /// </summary>
 [MessagePackObject]
 public class DeckListResponse
 {
+    [JsonPropertyName("maintenance_card_list")]
     [Key("maintenance_card_list")] public List<long> MaintenanceCardList { get; set; } = new();
+    [JsonPropertyName("user_deck_list")]
     [Key("user_deck_list")] public List<UserDeck>? UserDeckList { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckUpdateResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckUpdateResponse.cs
index ab7ff5a..7d58e53 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckUpdateResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/DeckUpdateResponse.cs
@@ -1,5 +1,6 @@
 using MessagePack;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
 
@@ -11,7 +12,10 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
 [MessagePackObject]
 public class DeckUpdateResponse
 {
+    [JsonPropertyName("user_deck_list")]
     [Key("user_deck_list")] public List<UserDeck>? UserDeckList { get; set; }
+    [JsonPropertyName("achieved_info")]
     [Key("achieved_info")] public Dictionary<string, object> AchievedInfo { get; set; } = new();
+    [JsonPropertyName("reward_list")]
     [Key("reward_list")] public List<Reward> RewardList { get; set; } = new();
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/EmptyDeckNumberResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/EmptyDeckNumberResponse.cs
index ac2f961..5acc74f 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/EmptyDeckNumberResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/EmptyDeckNumberResponse.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
 
@@ -6,5 +7,6 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
 public class EmptyDeckNumberResponse
 {
     /// <summary>The next free deck slot number. 0 indicates "no slots available".</summary>
+    [JsonPropertyName("empty_deck_num")]
     [Key("empty_deck_num")] public int EmptyDeckNum { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/SingleDeckResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/SingleDeckResponse.cs
index 9c42360..99b72ea 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/SingleDeckResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/SingleDeckResponse.cs
@@ -1,15 +1,17 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
 
 /// <summary>
 /// Single-deck-update response. Consumed by DeckListUtility.DeckUpdate(user_deck,
 /// format, DeckAttributeType.CustomDeck). Shape is "one UserDeck wrapped under
-/// `user_deck` key" — same for update_name, update_sleeve, update_leader_skin,
+/// `user_deck` key" 窶・same for update_name, update_sleeve, update_leader_skin,
 /// update_random_leader_skin.
 /// </summary>
 [MessagePackObject]
 public class SingleDeckResponse
 {
+    [JsonPropertyName("user_deck")]
     [Key("user_deck")] public UserDeck? UserDeck { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/GameStartResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/GameStartResponse.cs
index d2b3282..165ee51 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/GameStartResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/GameStartResponse.cs
@@ -1,11 +1,12 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
 
 /// <summary>
 /// Wire-shape mirrors production's <c>/check/game_start</c> response. Several fields here are
 /// NOT read by <c>Cute/GameStartCheckTask.Parse</c> (<c>now_viewer_id</c>, <c>now_name</c>,
-/// <c>now_rank</c> — those are consumed by sibling tasks); they're included because prod sends
+/// <c>now_rank</c> 窶・those are consumed by sibling tasks); they're included because prod sends
 /// them and the boot worked when we matched prod exactly. Removing them is a regression risk
 /// even though the parse-time decompile says they're unused.
 /// </summary>
@@ -13,6 +14,7 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
 public class GameStartResponse
 {
     /// <summary>The signed-in viewer's internal id. Prod always sends.</summary>
+    [JsonPropertyName("now_viewer_id")]
     [Key("now_viewer_id")]
     public long NowViewerId { get; set; }
 
@@ -20,10 +22,12 @@ public class GameStartResponse
     /// Whether the user has set a data-transfer password. Prod sends a non-null bool;
     /// <c>GameStartCheckTask.Parse</c> gates the read with <c>Keys.Contains</c>.
     /// </summary>
+    [JsonPropertyName("is_set_transition_password")]
     [Key("is_set_transition_password")]
     public bool IsSetTransitionPassword { get; set; }
 
     /// <summary>Viewer display name. Not read by GameStartCheckTask but sent by prod.</summary>
+    [JsonPropertyName("now_name")]
     [Key("now_name")]
     public string NowName { get; set; } = string.Empty;
 
@@ -32,60 +36,71 @@ public class GameStartResponse
     /// Stub for now until rank state is persisted; pinned to RankName_010 / RankName_017
     /// (matches prod's shape).
     /// </summary>
+    [JsonPropertyName("now_rank")]
     [Key("now_rank")]
     public Dictionary<string, string> NowRank { get; set; } = new();
 
     /// <summary>
-    /// Tutorial progress — **sent as a string on the wire** ("100" = tutorial complete).
+    /// Tutorial progress 窶・**sent as a string on the wire** ("100" = tutorial complete).
     /// <c>GameStartCheckTask.Parse</c> calls <c>.ToInt()</c> so LitJson coerces.
     /// </summary>
+    [JsonPropertyName("now_tutorial_step")]
     [Key("now_tutorial_step")]
     public string NowTutorialStep { get; set; } = "100";
 
     /// <summary>
     /// Linked social accounts. Per-entry shape in <see cref="TransitionAccountData"/>.
     /// </summary>
+    [JsonPropertyName("transition_account_data")]
     [Key("transition_account_data")]
     public List<TransitionAccountData> TransitionAccountData { get; set; } = new();
 
     /// <summary>
     /// When present, client overwrites <c>Certification.ViewerId</c> with this value. Optional
-    /// — leave null to omit. The serialization pipeline (JSON + msgpack via the translation
+    /// 窶・leave null to omit. The serialization pipeline (JSON + msgpack via the translation
     /// middleware) drops null properties end-to-end, so the client sees the key as absent.
     /// </summary>
+    [JsonPropertyName("rewrite_viewer_id")]
     [Key("rewrite_viewer_id")]
     public long? RewriteViewerId { get; set; }
 
     /// <summary>
     /// Presence indicates the user has applied for account deletion (value ignored by client at
-    /// this stage). Optional — leave null to omit.
+    /// this stage). Optional 窶・leave null to omit.
     /// </summary>
+    [JsonPropertyName("account_delete_reservation_status")]
     [Key("account_delete_reservation_status")]
     public int? AccountDeleteReservationStatus { get; set; }
 
     // --- Agreement / consent state (all required) ---
 
     /// <summary><c>PlayerStaticData.AgreementState</c> enum.</summary>
+    [JsonPropertyName("tos_state")]
     [Key("tos_state")]
     public int TosState { get; set; }
 
     /// <summary><c>PlayerStaticData.AgreementState</c> enum.</summary>
+    [JsonPropertyName("policy_state")]
     [Key("policy_state")]
     public int PolicyState { get; set; }
 
     /// <summary><c>PlayerStaticData.AgreementState</c> enum.</summary>
+    [JsonPropertyName("kor_authority_state")]
     [Key("kor_authority_state")]
     public int KorAuthorityState { get; set; }
 
     /// <summary>Current Terms of Service document id.</summary>
+    [JsonPropertyName("tos_id")]
     [Key("tos_id")]
     public int TosId { get; set; }
 
     /// <summary>Current Privacy Policy document id.</summary>
+    [JsonPropertyName("policy_id")]
     [Key("policy_id")]
     public int PolicyId { get; set; }
 
     /// <summary>Current Korean authority consent document id.</summary>
+    [JsonPropertyName("kor_authority_id")]
     [Key("kor_authority_id")]
     public int KorAuthorityId { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/IndexResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/IndexResponse.cs
index 0eda605..96a597a 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/IndexResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/IndexResponse.cs
@@ -1,5 +1,6 @@
 using MessagePack;
 using SVSim.Database.Enums;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
 
@@ -8,20 +9,28 @@ public class IndexResponse
 {
     #region Primitive Returns
 
+    [JsonPropertyName("spot_point")]
     [Key("spot_point")]
     public int SpotPoint { get; set; }
+    [JsonPropertyName("is_available_colosseum_free_entry")]
     [Key("is_available_colosseum_free_entry")]
     public bool IsAvailableColosseumFreeEntry { get; set; }
+    [JsonPropertyName("friend_battle_invite_count")]
     [Key("friend_battle_invite_count")]
     public int FriendBattleInviteCount { get; set; }
+    [JsonPropertyName("battle_recovery_status")]
     [Key("battle_recovery_status")]
     public int BattleRecoveryStatus { get; set; }
+    [JsonPropertyName("room_recovery_status")]
     [Key("room_recovery_status")]
     public int RoomRecoveryStatus { get; set; }
+    [JsonPropertyName("is_battle_pass_period")]
     [Key("is_battle_pass_period")]
     public int IsBattlePassPeriod { get; set; }
+    [JsonPropertyName("card_set_id_for_resource_dl_view")]
     [Key("card_set_id_for_resource_dl_view")]
     public int CardSetIdForResourceDlView { get; set; }
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")]
     public int DeckFormat { get; set; } = 1;
 
@@ -29,12 +38,15 @@ public class IndexResponse
 
     #region Basic User Data
 
+    [JsonPropertyName("user_tutorial")]
     [Key("user_tutorial")]
     public UserTutorial UserTutorial { get; set; } = new UserTutorial();
 
+    [JsonPropertyName("user_info")]
     [Key("user_info")]
     public UserInfo UserInfo { get; set; } = new UserInfo();
 
+    [JsonPropertyName("user_crystal_count")]
     [Key("user_crystal_count")]
     public UserCurrency UserCurrency { get; set; } = new UserCurrency();
 
@@ -42,45 +54,56 @@ public class IndexResponse
 
     #region Inventory Data
 
+    [JsonPropertyName("user_item_list")]
     [Key("user_item_list")]
     public List<UserItem> UserItems { get; set; } = new();
 
+    [JsonPropertyName("user_deck_rotation")]
     [Key("user_deck_rotation")]
     public UserFormatDeckInfo UserRotationDecks { get; set; } = new();
 
+    [JsonPropertyName("user_deck_unlimited")]
     [Key("user_deck_unlimited")]
     public UserFormatDeckInfo UserUnlimitedDecks { get; set; } = new();
 
+    [JsonPropertyName("user_deck_my_rotation")]
     [Key("user_deck_my_rotation")]
     public UserFormatDeckInfo UserMyRotationDecks { get; set; } = new();
 
+    [JsonPropertyName("user_card_list")]
     [Key("user_card_list")]
     public List<UserCard> UserCards { get; set; } = new();
 
+    [JsonPropertyName("user_class_list")]
     [Key("user_class_list")]
     public List<UserClass> UserClasses { get; set; } = new();
 
     /// <summary>
     /// Wire is an array; parser iterates by index (LoadDetail.cs:358-360).
     /// </summary>
+    [JsonPropertyName("user_sleeve_list")]
     [Key("user_sleeve_list")]
     public List<SleeveIdentifier> Sleeves { get; set; } = new();
 
+    [JsonPropertyName("user_emblem_list")]
     [Key("user_emblem_list")]
     public List<EmblemIdentifier> UserEmblems { get; set; } = new();
 
+    [JsonPropertyName("user_degree_list")]
     [Key("user_degree_list")]
     public List<DegreeIdentifier> UserDegrees { get; set; } = new();
 
     /// <summary>
     /// Wire is an array; parser iterates by index (LoadDetail.cs:348-356).
     /// </summary>
+    [JsonPropertyName("user_leader_skin_list")]
     [Key("user_leader_skin_list")]
     public List<UserLeaderSkin> LeaderSkins { get; set; } = new();
 
     /// <summary>
     /// Wire is string[]; parser calls .ToString() on each element (LoadDetail.cs:387-392).
     /// </summary>
+    [JsonPropertyName("user_mypage_list")]
     [Key("user_mypage_list")]
     public List<string> MyPageBackgrounds { get; set; } = new();
 
@@ -92,15 +115,19 @@ public class IndexResponse
     /// Wire is an array of 5 entries; parser uses deck_format as discriminator
     /// (LoadDetail.cs:527-538).
     /// </summary>
+    [JsonPropertyName("user_rank")]
     [Key("user_rank")]
     public List<UserRankInfo> UserRankInfo { get; set; } = new();
 
+    [JsonPropertyName("user_rank_match_list")]
     [Key("user_rank_match_list")]
     public List<UserRankedMatches> UserRankedMatches { get; set; } = new();
 
+    [JsonPropertyName("daily_login_bonus")]
     [Key("daily_login_bonus")]
     public DailyLoginBonus DailyLoginBonus { get; set; } = new();
 
+    [JsonPropertyName("challenge_config")]
     [Key("challenge_config")]
     public ArenaConfig ArenaConfig { get; set; } = new();
 
@@ -108,6 +135,7 @@ public class IndexResponse
 
     #region Global Data
 
+    [JsonPropertyName("red_ether_overwrite_list")]
     [Key("red_ether_overwrite_list")]
     public List<RedEtherOverride> RedEtherOverrides { get; set; } = new();
 
@@ -115,71 +143,94 @@ public class IndexResponse
     /// Wire is a flat number[]; parser passes it straight to SetMaintenanceCardIds
     /// (LoadDetail.cs:165).
     /// </summary>
+    [JsonPropertyName("maintenance_card_list")]
     [Key("maintenance_card_list")]
     public List<long> MaintenanceCards { get; set; } = new();
 
+    /// <summary>
+    /// Client's ArenaData(JsonData) ctor reads data[0] unconditionally inside the
+    /// LoadDetail.cs:261 Keys.Contains("arena_info") branch — an empty list crashes
+    /// /load/index with ArgumentOutOfRangeException. Send null (omitted on wire) when
+    /// there's no arena to advertise.
+    /// </summary>
+    [JsonPropertyName("arena_info")]
     [Key("arena_info")]
-    public List<ArenaInfo> ArenaInfos { get; set; } = new();
+    public List<ArenaInfo>? ArenaInfos { get; set; }
 
     /// <summary>
     /// Wire is an array; client uses POSITIONAL logic (index >= 24 = master ranks,
     /// LoadDetail.cs:417-422). Order must match repository's ordering.
     /// </summary>
+    [JsonPropertyName("rank_info")]
     [Key("rank_info")]
     public List<RankInfo> RankInfo { get; set; } = new();
 
     /// <summary>
     /// Wire is an array; parser iterates by index (LoadDetail.cs:425-434).
     /// </summary>
+    [JsonPropertyName("class_exp")]
     [Key("class_exp")]
     public List<ClassExp> ClassExp { get; set; } = new();
 
+    [JsonPropertyName("loading_exclusion_card_list")]
     [Key("loading_exclusion_card_list")]
     public List<long> LoadingTipCardExclusions { get; set; } = new();
 
+    [JsonPropertyName("default_setting")]
     [Key("default_setting")]
     public DefaultSettings DefaultSettings { get; set; } = new();
 
+    [JsonPropertyName("unlimited_restricted_base_card_id_list")]
     [Key("unlimited_restricted_base_card_id_list")]
     public Dictionary<string, int> UnlimitedBanList { get; set; } = new();
 
     /// <summary>
-    /// Client unconditionally accesses [1] and [Count-1] (LoadDetail.cs:184) — list MUST
+    /// Client unconditionally accesses [1] and [Count-1] (LoadDetail.cs:184) 窶・list MUST
     /// have at least 2 entries or the client crashes.
     /// </summary>
+    [JsonPropertyName("rotation_card_set_id_list")]
     [Key("rotation_card_set_id_list")]
     public List<CardSetIdentifier> RotationSets { get; set; } = new();
 
     /// <summary>
     /// Wire is a flat number[]; parser iterates and reads .ToInt() (LoadDetail.cs:463-468).
     /// </summary>
+    [JsonPropertyName("reprinted_base_card_ids")]
     [Key("reprinted_base_card_ids")]
     public List<long> ReprintedCards { get; set; } = new();
 
+    [JsonPropertyName("spot_cards")]
     [Key("spot_cards")]
     public Dictionary<string, int> SpotCards { get; set; } = new();
 
+    [JsonPropertyName("pre_release_info")]
     [Key("pre_release_info")]
     public PreReleaseInfo? PreReleaseInfo { get; set; }
 
+    [JsonPropertyName("my_rotation_info")]
     [Key("my_rotation_info")]
     public MyRotationInfo? MyRotationInfo { get; set; }
 
+    [JsonPropertyName("avatar_info")]
     [Key("avatar_info")]
     public MyRotationInfo? AvatarRotationInfo { get; set; }
 
+    [JsonPropertyName("feature_maintenance_list")]
     [Key("feature_maintenance_list")]
     public List<FeatureMaintenance> FeatureMaintenances { get; set; } = new();
 
+    [JsonPropertyName("special_crystal_info")]
     [Key("special_crystal_info")]
     public List<SpecialCrystalInfo> SpecialCrystalInfos { get; set; } = new();
 
+    [JsonPropertyName("battle_pass_level_info")]
     [Key("battle_pass_level_info")]
     public Dictionary<string, BattlePassLevel>? BattlePassLevelInfo { get; set; }
 
     /// <summary>
     /// Wire is string[]; parser calls .ToString() on each element (LoadDetail.cs:493-499).
     /// </summary>
+    [JsonPropertyName("open_battle_field_id_list")]
     [Key("open_battle_field_id_list")]
     public List<string> OpenBattlefieldIds { get; set; } = new();
 
@@ -187,9 +238,11 @@ public class IndexResponse
 
     #region Misc Data
 
+    [JsonPropertyName("loot_box_regulation")]
     [Key("loot_box_regulation")]
     public LootBoxRegulations LootBoxRegulations { get; set; } = new();
 
+    [JsonPropertyName("gathering_info")]
     [Key("gathering_info")]
     public GatheringInfo GatheringInfo { get; set; } = new();
 
@@ -197,6 +250,7 @@ public class IndexResponse
     /// Spec is unclear whether this is returned at /load/index or only at /config/* endpoints
     /// (load-index.md line 390). Pending live-capture confirmation; harmless extra.
     /// </summary>
+    [JsonPropertyName("user_config")]
     [Key("user_config")]
     public UserConfig UserConfig { get; set; } = new();
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeDeckListResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeDeckListResponse.cs
index 4074327..2743073 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeDeckListResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeDeckListResponse.cs
@@ -1,21 +1,25 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
 
 /// <summary>
 /// Same shape consumed by DeckGroupListData(jsonData, Format.All). Per-format keys are
-/// conditional — omit (don't send empty arrays) for formats the server doesn't enable.
+/// conditional 窶・omit (don't send empty arrays) for formats the server doesn't enable.
 /// </summary>
 [MessagePackObject]
 public class PracticeDeckListResponse
 {
     /// <summary>Card ids currently disabled for maintenance (client unions with global list).</summary>
+    [JsonPropertyName("maintenance_card_list")]
     [Key("maintenance_card_list")] public List<long> MaintenanceCardList { get; set; } = new();
 
+    [JsonPropertyName("user_deck_rotation")]
     [Key("user_deck_rotation")] public List<UserDeck>? UserDeckRotation { get; set; }
+    [JsonPropertyName("user_deck_unlimited")]
     [Key("user_deck_unlimited")] public List<UserDeck>? UserDeckUnlimited { get; set; }
 
     // The remaining format keys (pre_rotation, crossover, my_rotation, avatar, default_deck_list,
     // trial_deck_list, crossover_trial_deck_list, build_deck_list, user_leader_skin_setting_list)
-    // are all conditional — added when those formats are enabled.
+    // are all conditional 窶・added when those formats are enabled.
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeFinishResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeFinishResponse.cs
index 121ae47..ca26956 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeFinishResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeFinishResponse.cs
@@ -1,5 +1,6 @@
 using MessagePack;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
 
@@ -7,20 +8,25 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
 public class PracticeFinishResponse
 {
     /// <summary>Class XP gained this match.</summary>
+    [JsonPropertyName("get_class_experience")]
     [Key("get_class_experience")] public int GetClassExperience { get; set; }
 
     /// <summary>Total accumulated class XP for the played class after this match.</summary>
+    [JsonPropertyName("class_experience")]
     [Key("class_experience")] public int ClassExperience { get; set; }
 
     /// <summary>Class level after this match (post-promotion if XP rolled over).</summary>
+    [JsonPropertyName("class_level")]
     [Key("class_level")] public int ClassLevel { get; set; } = 1;
 
     /// <summary>
     /// Missions / achievements / rewards rollup. Empty dict means "nothing accumulated"
     /// (spec: parser tolerates empty object).
     /// </summary>
+    [JsonPropertyName("achieved_info")]
     [Key("achieved_info")] public Dictionary<string, object> AchievedInfo { get; set; } = new();
 
     /// <summary>Standard reward grants applied to user's inventory. Empty by default.</summary>
+    [JsonPropertyName("reward_list")]
     [Key("reward_list")] public List<Reward> RewardList { get; set; } = new();
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeOpponent.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeOpponent.cs
index 4911eb5..8686dd8 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeOpponent.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeOpponent.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
 
@@ -6,38 +7,49 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
 public class PracticeOpponent
 {
     /// <summary>Practice slot id (unique per entry; AI opponent identifier).</summary>
+    [JsonPropertyName("practice_id")]
     [Key("practice_id")] public int PracticeId { get; set; }
 
     /// <summary>
     /// Text-table id resolved client-side via Data.Master.GetPracticeText(text_id).
-    /// Stringified int — client calls .ToString() before lookup. Sent as string to be safe.
+    /// Stringified int 窶・client calls .ToString() before lookup. Sent as string to be safe.
     /// </summary>
+    [JsonPropertyName("text_id")]
     [Key("text_id")] public string TextId { get; set; } = string.Empty;
 
     /// <summary>Class (leader) id the AI plays.</summary>
+    [JsonPropertyName("class_id")]
     [Key("class_id")] public int ClassId { get; set; }
 
     /// <summary>Portrait / character id (which leader art the AI uses).</summary>
+    [JsonPropertyName("chara_id")]
     [Key("chara_id")] public int CharaId { get; set; }
 
     /// <summary>Title-degree id shown next to the AI's name.</summary>
+    [JsonPropertyName("degree_id")]
     [Key("degree_id")] public int DegreeId { get; set; }
 
     /// <summary>AI deck-strength tier (drives which preset deck the AI uses).</summary>
+    [JsonPropertyName("ai_deck_level")]
     [Key("ai_deck_level")] public int AiDeckLevel { get; set; }
 
     /// <summary>AI decision-making tier.</summary>
+    [JsonPropertyName("ai_logic_level")]
     [Key("ai_logic_level")] public int AiLogicLevel { get; set; }
 
     /// <summary>Starting HP for the AI side (often 20).</summary>
+    [JsonPropertyName("ai_max_life")]
     [Key("ai_max_life")] public int AiMaxLife { get; set; } = 20;
 
     /// <summary>3D battle-field asset id (string on the wire; client int.TryParse's it).</summary>
+    [JsonPropertyName("battle3dfield_id")]
     [Key("battle3dfield_id")] public string Battle3dFieldId { get; set; } = "1";
 
     /// <summary>Optional. true => entry disabled, client prepends maintenance suffix.</summary>
+    [JsonPropertyName("is_maintenance")]
     [Key("is_maintenance")] public bool? IsMaintenance { get; set; }
 
     /// <summary>true => entry is a special "campaign" practice (event-tied).</summary>
+    [JsonPropertyName("is_campaign_practice")]
     [Key("is_campaign_practice")] public bool IsCampaignPractice { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeStartResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeStartResponse.cs
index d598add..73e9d83 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeStartResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeStartResponse.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
 
@@ -8,7 +9,8 @@ public class PracticeStartResponse
     /// <summary>
     /// Optional mission/achievement evaluation snapshot. Spec: safe to omit entirely;
     /// client tolerates absence (defensive `Keys.Contains` check). Always null in our
-    /// minimal impl — we don't model missions.
+    /// minimal impl 窶・we don't model missions.
     /// </summary>
+    [JsonPropertyName("mission_parameter")]
     [Key("mission_parameter")] public object? MissionParameter { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/SpecialTitleCheckResponse.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/SpecialTitleCheckResponse.cs
index 4b7da49..44ab8fa 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/SpecialTitleCheckResponse.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Responses/SpecialTitleCheckResponse.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
 
@@ -9,6 +10,7 @@ public class SpecialTitleCheckResponse
     /// Numeric string. "0"/"1" are the built-in default title screens; any other value
     /// is treated as an asset-bundle id. When omitted, the client defaults to "0".
     /// </summary>
+    [JsonPropertyName("title_image_id")]
     [Key("title_image_id")]
     public string? TitleImageId { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/ShopExpiryInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/ShopExpiryInfo.cs
index 3a0f522..25b7891 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/ShopExpiryInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/ShopExpiryInfo.cs
@@ -1,12 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class ShopExpiryInfo
 {
+    [JsonPropertyName("sales_period_time")]
     [Key("sales_period_time")]
     public DateTime? SalesPeriodTime { get; set; }
+    [JsonPropertyName("sales_period_series")]
     [Key("sales_period_series")]
     public int? SalesPeriodSeries { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/SleeveIdentifier.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/SleeveIdentifier.cs
index b1a1c51..49ae961 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/SleeveIdentifier.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/SleeveIdentifier.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -11,6 +12,7 @@ public class SleeveIdentifier
     /// <summary>
     /// The id of the sleeve.
     /// </summary>
+    [JsonPropertyName("sleeve_id")]
     [Key("sleeve_id")]
     public long SleeveId { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSchedule.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSchedule.cs
index c495e15..b4e0a1f 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSchedule.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSchedule.cs
@@ -1,12 +1,15 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class SpecialRotationSchedule
 {
+    [JsonPropertyName("gathering")]
     [Key("gathering")]
     public DateRange Gathering { get; set; } = new DateRange();
+    [JsonPropertyName("free_battle")]
     [Key("free_battle")]
     public DateRange FreeBattle { get; set; } = new DateRange();
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSetting.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSetting.cs
index 078c98a..5f4b7d8 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSetting.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/SpecialRotationSetting.cs
@@ -1,22 +1,26 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class SpecialRotationSetting
 {
+    [JsonPropertyName("rotation_id")]
     [Key("rotation_id")]
     public int RotationId { get; set; }
     
     /// <summary>
     /// Formatted as 'setid|setid|setid...'.
     /// </summary>
+    [JsonPropertyName("card_set_ids")]
     [Key("card_set_ids")]
     public string CardSetIds { get; set; }
     
     /// <summary>
     /// Formatted as 'abilityid|abilityid|abilityid...'.
     /// </summary>
+    [JsonPropertyName("abilities")]
     [Key("abilities")]
     public string Abilities { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/TransitionAccountData.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/TransitionAccountData.cs
index 4d4044c..b2e5048 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/TransitionAccountData.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/TransitionAccountData.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -6,7 +7,7 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 /// Per-link entry in <c>transition_account_data</c>. Production sends three string fields per
 /// entry even though <c>GameStartCheckTask.Parse</c> only reads <c>social_account_type</c>.
 /// The extra two are read by adjacent tasks (<c>GetGameDataByTransitionCode</c>,
-/// <c>GetGameDataBySocialAccountTask</c>) — kept here so the wire matches prod regardless of
+/// <c>GetGameDataBySocialAccountTask</c>) 窶・kept here so the wire matches prod regardless of
 /// which task ends up consuming the payload.
 /// </summary>
 [MessagePackObject]
@@ -15,22 +16,25 @@ public class TransitionAccountData
     /// <summary>
     /// The social provider's account id (e.g. SteamID as a string). Sent as string on the wire.
     /// </summary>
+    [JsonPropertyName("social_account_id")]
     [Key("social_account_id")]
     public string? SocialAccountId { get; set; }
 
     /// <summary>
     /// <c>Cute/CuteNetworkDefine.ACCOUNT_TYPE</c> enum, **sent as string** on the wire even
     /// though it's numeric. <c>GameStartCheckTask.Parse</c> calls <c>.ToInt()</c> on it so
-    /// LitJson coerces transparently — but matching prod's string form makes us safer against
+    /// LitJson coerces transparently 窶・but matching prod's string form makes us safer against
     /// future client paths that might compare it as a literal.
     /// 1=GooglePlay, 2=GameCenter, 3=Facebook, 4=DMM, 5=Steam, 6=AppleID.
     /// </summary>
+    [JsonPropertyName("social_account_type")]
     [Key("social_account_type")]
     public string? SocialAccountType { get; set; }
 
     /// <summary>
     /// The viewer id this social connection is linked to. Sent as string.
     /// </summary>
+    [JsonPropertyName("connected_viewer_id")]
     [Key("connected_viewer_id")]
     public string? ConnectedViewerId { get; set; }
 }
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserCard.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserCard.cs
index 64d7dc4..8299251 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserCard.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserCard.cs
@@ -1,5 +1,6 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -12,12 +13,14 @@ public class UserCard : CardIdentifier
     /// <summary>
     /// The number of the specified card the user has.
     /// </summary>
+    [JsonPropertyName("number")]
     [Key("number")]
     public int Count { get; set; }
     
     /// <summary>
     /// Whether the card is protected from dusting.
     /// </summary>
+    [JsonPropertyName("is_protected")]
     [Key("is_protected")]
     public int IsProtected { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserClass.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserClass.cs
index f959bf5..af95071 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserClass.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserClass.cs
@@ -1,32 +1,41 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserClass
 {
+    [JsonPropertyName("class_id")]
     [Key("class_id")]
     public int ClassId { get; set; }
     
+    [JsonPropertyName("is_available")]
     [Key("is_available")]
     public int IsAvailable { get; set; }
     
+    [JsonPropertyName("level")]
     [Key("level")]
     public int Level { get; set; }
     
+    [JsonPropertyName("exp")]
     [Key("exp")]
     public int Exp { get; set; }
     
+    [JsonPropertyName("is_random_leader_skin")]
     [Key("is_random_leader_skin")]
     public int IsRandomLeaderSkin { get; set; }
     
+    [JsonPropertyName("leader_skin_id")]
     [Key("leader_skin_id")]
     public int LeaderSkinId { get; set; }
 
+    [JsonPropertyName("leader_skin_id_list")]
     [Key("leader_skin_id_list")]
     public List<int> LeaderSkinIds { get; set; } = new List<int>();
     
+    [JsonPropertyName("default_leader_skin_id")]
     [Key("default_leader_skin_id")]
     public int DefaultLeaderSkinId { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserConfig.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserConfig.cs
index bbce7f8..6272c1b 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserConfig.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserConfig.cs
@@ -1,22 +1,30 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserConfig
 {
+    [JsonPropertyName("receive_invitation")]
     [Key("receive_invitation")]
     public int ReceiveInvitation { get; set; }
+    [JsonPropertyName("receive_invitation_in_battle")]
     [Key("receive_invitation_in_battle")]
     public int ReceiveInvitationInBattle { get; set; }
+    [JsonPropertyName("receive_invitation_in_offline")]
     [Key("receive_invitation_in_offline")]
     public int ReceiveInvitationInOffline { get; set; }
+    [JsonPropertyName("receive_friend_apply")]
     [Key("receive_friend_apply")]
     public int ReceiveFriendApply { get; set; }
+    [JsonPropertyName("is_allow_send_adjust")]
     [Key("is_allow_send_adjust")]
     public int IsAllowSendAdjust { get; set; }
+    [JsonPropertyName("is_foil_preferred")]
     [Key("is_foil_preferred")]
     public int IsFoilPreferred { get; set; }
+    [JsonPropertyName("is_prize_preferred")]
     [Key("is_prize_preferred")]
     public int IsPrizePreferred { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserCurrency.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserCurrency.cs
index 59581a9..f864751 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserCurrency.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserCurrency.cs
@@ -1,31 +1,43 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserCurrency
 {
+    [JsonPropertyName("viewer_id")]
     [Key("viewer_id")]
     public long ViewerId { get; set; }
+    [JsonPropertyName("crystal")]
     [Key("crystal")]
     public ulong Crystals { get; set; }
+    [JsonPropertyName("crystal_android")]
     [Key("crystal_android")]
     public ulong AndroidCrystals { get; set; }
+    [JsonPropertyName("crystal_ios")]
     [Key("crystal_ios")]
     public ulong IosCrystals { get; set; }
+    [JsonPropertyName("crystal_steam")]
     [Key("crystal_steam")]
     public ulong SteamCrystals { get; set; }
+    [JsonPropertyName("crystal_dmm")]
     [Key("crystal_dmm")]
     public ulong DmmCrystals { get; set; }
+    [JsonPropertyName("free_crystal")]
     [Key("free_crystal")]
     public ulong FreeCrystals { get; set; }
+    [JsonPropertyName("total_crystal")]
     [Key("total_crystal")]
     public ulong TotalCrystals { get; set; }
+    [JsonPropertyName("life_total_crystal")]
     [Key("life_total_crystal")]
     public ulong LifeTotalCrystals { get; set; }
+    [JsonPropertyName("red_ether")]
     [Key("red_ether")]
     public ulong RedEther { get; set; }
+    [JsonPropertyName("rupy")]
     [Key("rupy")]
     public ulong Rupees { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserDeck.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserDeck.cs
index ccfb7b9..201f9ae 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserDeck.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserDeck.cs
@@ -1,5 +1,6 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -9,34 +10,49 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 [MessagePackObject]
 public class UserDeck
 {
+    [JsonPropertyName("deck_no")]
     [Key("deck_no")]
     public int DeckNumber { get; set; }
+    [JsonPropertyName("class_id")]
     [Key("class_id")]
     public int ClassId { get; set; }
+    [JsonPropertyName("sleeve_id")]
     [Key("sleeve_id")]
     public int SleeveId { get; set; }
+    [JsonPropertyName("leader_skin_id")]
     [Key("leader_skin_id")]
     public int LeaderSkinId { get; set; }
+    [JsonPropertyName("deck_name")]
     [Key("deck_name")]
     public string Name { get; set; } = string.Empty;
+    [JsonPropertyName("card_id_array")]
     [Key("card_id_array")]
     public List<long> Cards { get; set; } = new List<long>();
+    [JsonPropertyName("is_complete_deck")]
     [Key("is_complete_deck")]
     public int IsCompleteDeck { get; set; }
+    [JsonPropertyName("restricted_card_exists")]
     [Key("restricted_card_exists")]
     public bool RestrictedCardExists { get; set; }
+    [JsonPropertyName("is_available_deck")]
     [Key("is_available_deck")]
     public int IsAvailable { get; set; }
+    [JsonPropertyName("maintenance_card_ids")]
     [Key("maintenance_card_ids")]
     public List<long> MaintenanceCards { get; set; } = new List<long>();
+    [JsonPropertyName("is_include_un_possession_card")]
     [Key("is_include_un_possession_card")]
     public bool IncludesNonCollectibleCards { get; set; }
+    [JsonPropertyName("is_random_leader_skin")]
     [Key("is_random_leader_skin")]
     public int IsRandomLeaderSkin { get; set; }
+    [JsonPropertyName("leader_skin_id_list")]
     [Key("leader_skin_id_list")]
     public List<int> LeaderSkinIds { get; set; } = new List<int> { 0 };
+    [JsonPropertyName("order_num")]
     [Key("order_num")]
     public int Order { get; set; }
+    [JsonPropertyName("create_deck_time")]
     [Key("create_deck_time")]
     public DateTime DeckCreateTime { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserFormatDeckInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserFormatDeckInfo.cs
index 4ed377c..83a799e 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserFormatDeckInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserFormatDeckInfo.cs
@@ -1,13 +1,16 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserFormatDeckInfo
 {
+    [JsonPropertyName("format")]
     [Key("format")] 
     public string Format { get; set; } = string.Empty;
 
+    [JsonPropertyName("user_deck_list")]
     [Key("user_deck_list")]
     public List<UserDeck> UserDecks { get; set; } = new List<UserDeck>();
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserInfo.cs
index 6652d22..994a0ce 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserInfo.cs
@@ -1,39 +1,53 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserInfo
 {
+    [JsonPropertyName("device_type")]
     [Key("device_type")]
     public int DeviceType { get; set; }
+    [JsonPropertyName("name")]
     [Key("name")]
     public string Name { get; set; } = string.Empty;
+    [JsonPropertyName("country_code")]
     [Key("country_code")]
     public string CountryCode { get; set; } = string.Empty;
+    [JsonPropertyName("max_friend")]
     [Key("max_friend")]
     public int MaxFriend { get; set; }
+    [JsonPropertyName("last_play_time")]
     [Key("last_play_time")]
     public DateTime LastPlayTime { get; set; }
+    [JsonPropertyName("is_received_two_pick_mission")]
     [Key("is_received_two_pick_mission")]
     public int HasReceivedPickTwoMission { get; set; }
     /// <summary>
     /// Birth date as yyyy-MM-dd. Parser does .ToString() on this field (LoadDetail.cs:203).
     /// Format verified against live capture pending.
     /// </summary>
+    [JsonPropertyName("birth")]
     [Key("birth")]
     public string Birthday { get; set; } = string.Empty;
+    [JsonPropertyName("selected_emblem_id")]
     [Key("selected_emblem_id")]
     public long SelectedEmblemId { get; set; }
+    [JsonPropertyName("selected_degree_id")]
     [Key("selected_degree_id")]
     public int SelectedDegreeId { get; set; }
+    [JsonPropertyName("mission_change_time")]
     [Key("mission_change_time")]
     public DateTime MissionChangeTime { get; set; }
+    [JsonPropertyName("mission_receive_type")]
     [Key("mission_receive_type")]
     public int MissionReceiveType { get; set; }
+    [JsonPropertyName("is_official")]
     [Key("is_official")]
     public int IsOfficial { get; set; }
+    [JsonPropertyName("is_official_mark_displayed")]
     [Key("is_official_mark_displayed")]
     public int IsOfficialMarkDisplayed { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserItem.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserItem.cs
index 5bbd050..f35df85 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserItem.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserItem.cs
@@ -1,14 +1,17 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserItem
 {
+    [JsonPropertyName("item_id")]
     [Key("item_id")]
     public int ItemId { get; set; }
     
+    [JsonPropertyName("number")]
     [Key("number")]
     public int Number { get; set; }
 
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserLeaderSkin.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserLeaderSkin.cs
index b302074..37e5844 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserLeaderSkin.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserLeaderSkin.cs
@@ -1,19 +1,25 @@
 using MessagePack;
 using SVSim.Database.Models;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserLeaderSkin
 {
+    [JsonPropertyName("leader_skin_id")]
     [Key("leader_skin_id")]
     public int Id { get; set; }
+    [JsonPropertyName("leader_skin_name")]
     [Key("leader_skin_name")] 
     public string Name { get; set; } = string.Empty;
+    [JsonPropertyName("class_id")]
     [Key("class_id")]
     public int ClassId { get; set; }
+    [JsonPropertyName("emote_id")]
     [Key("emote_id")]
     public int EmoteId { get; set; }
+    [JsonPropertyName("is_owned")]
     [Key("is_owned")]
     public bool IsOwned { get; set; }
 
@@ -21,7 +27,7 @@ public class UserLeaderSkin
     {
         this.Id = leaderSkin.Id;
         this.Name = leaderSkin.Name;
-        // Class is nullable — BaseDataSeeder maps CSV class_chara_id=0 to null. Fall back to
+        // Class is nullable 窶・BaseDataSeeder maps CSV class_chara_id=0 to null. Fall back to
         // the FK column (also nullable) and finally 0 for class-agnostic skins.
         this.ClassId = leaderSkin.Class?.Id ?? leaderSkin.ClassId ?? 0;
         this.EmoteId = leaderSkin.EmoteId;
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserPromotionMatch.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserPromotionMatch.cs
index 4995cd8..54eaf59 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserPromotionMatch.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserPromotionMatch.cs
@@ -1,16 +1,21 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserPromotionMatch
 {
+    [JsonPropertyName("match_count")]
     [Key("match_count")]
     public int MatchCount { get; set; }
+    [JsonPropertyName("battle_result")]
     [Key("battle_result")]
     public int BattleResult { get; set; }
+    [JsonPropertyName("win")]
     [Key("win")]
     public int Wins { get; set; }
+    [JsonPropertyName("lose")]
     [Key("lose")]
     public int Losses { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankInfo.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankInfo.cs
index 5d88369..3e0bcb3 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankInfo.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankInfo.cs
@@ -1,34 +1,48 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserRankInfo
 {
+    [JsonPropertyName("deck_format")]
     [Key("deck_format")]
     public int DeckFormat { get; set; }
+    [JsonPropertyName("rank")]
     [Key("rank")]
     public int Rank { get; set; }
+    [JsonPropertyName("battle_point")]
     [Key("battle_point")]
     public int BattlePoints { get; set; }
+    [JsonPropertyName("successive_win_number")]
     [Key("successive_win_number")]
     public int WinStreak { get; set; }
+    [JsonPropertyName("successive_losses_number")]
     [Key("successive_losses_number")]
     public int LossStreak { get; set; }
+    [JsonPropertyName("is_promotion")]
     [Key("is_promotion")]
     public int IsPromotion { get; set; }
+    [JsonPropertyName("is_master_rank")]
     [Key("is_master_rank")]
     public int IsMasterRank { get; set; }
+    [JsonPropertyName("is_grand_master_rank")]
     [Key("is_grand_master_rank")]
     public int IsGrandMasterRank { get; set; }
+    [JsonPropertyName("master_point")]
     [Key("master_point")]
     public int MasterPoints { get; set; }
+    [JsonPropertyName("period_grand_master_point")]
     [Key("period_grand_master_point")]
     public int PeriodGrandMasterPoints { get; set; }
+    [JsonPropertyName("target_grand_master_point")]
     [Key("target_grand_master_point")]
     public int TargetGrandMasterPoints { get; set; }
+    [JsonPropertyName("current_grand_master_point")]
     [Key("current_grand_master_point")]
     public int CurrentGrandMasterPoints { get; set; }
+    [JsonPropertyName("user_promotion_match")]
     [Key("user_promotion_match")]
     public UserPromotionMatch? UserPromotionMatch { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankedMatches.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankedMatches.cs
index a1e706b..9732a70 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankedMatches.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserRankedMatches.cs
@@ -1,18 +1,24 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 [MessagePackObject]
 public class UserRankedMatches
 {
+    [JsonPropertyName("class_id")]
     [Key("class_id")]
     public int ClassId { get; set; }
+    [JsonPropertyName("match_count")]
     [Key("match_count")]
     public int MatchCount { get; set; }
+    [JsonPropertyName("win")]
     [Key("win")]
     public int Wins { get; set; }
+    [JsonPropertyName("lose")]
     [Key("lose")]
     public int Losses { get; set; }
+    [JsonPropertyName("viewer_id")]
     [Key("viewer_id")]
     public ulong ViewerId { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/UserTutorial.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/UserTutorial.cs
index 3419a7f..93c2002 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/UserTutorial.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/UserTutorial.cs
@@ -1,4 +1,5 @@
 using MessagePack;
+using System.Text.Json.Serialization;
 
 namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
@@ -11,6 +12,7 @@ public class UserTutorial
     /// <summary>
     /// The current tutorial step they are on.
     /// </summary>
+    [JsonPropertyName("tutorial_step")]
     [Key("tutorial_step")]
     public int TutorialStep { get; set; }
 }
\ No newline at end of file
diff --git a/SVSim.UnitTests/Controllers/DeckControllerTests.cs b/SVSim.UnitTests/Controllers/DeckControllerTests.cs
index 2b9ebd5..ac24f6c 100644
--- a/SVSim.UnitTests/Controllers/DeckControllerTests.cs
+++ b/SVSim.UnitTests/Controllers/DeckControllerTests.cs
@@ -10,9 +10,9 @@ using SVSim.UnitTests.Infrastructure;
 namespace SVSim.UnitTests.Controllers;
 
 /// <summary>
-/// Coverage for <c>/deck/*</c> — the deck-editor CRUD surface. Plain-JSON path; the
-/// camelCase'd C# property names are what tests see (see the note on Phase 6 / encrypted
-/// pipeline for the msgpack contract).
+/// Coverage for <c>/deck/*</c> — the deck-editor CRUD surface. Tests assert against the
+/// <c>[Key("...")]</c>-driven wire keys (mirrored to <c>[JsonPropertyName]</c>); these are
+/// the names the decompiled client actually parses, NOT <c>SnakeCaseLower(C# property)</c>.
 /// </summary>
 public class DeckControllerTests
 {
@@ -53,7 +53,7 @@ public class DeckControllerTests
         Assert.That(decks.GetArrayLength(), Is.EqualTo(2),
             "Only Rotation-format decks should be returned for a Rotation request.");
         var names = Enumerable.Range(0, decks.GetArrayLength())
-            .Select(i => decks[i].GetProperty("name").GetString())
+            .Select(i => decks[i].GetProperty("deck_name").GetString())
             .ToList();
         Assert.That(names, Is.EquivalentTo(new[] { "Slot 1", "Slot 2" }));
     }
@@ -74,7 +74,7 @@ public class DeckControllerTests
         using var doc = JsonDocument.Parse(body);
         var decks = doc.RootElement.GetProperty("user_deck_list");
         Assert.That(decks.GetArrayLength(), Is.EqualTo(1));
-        Assert.That(decks[0].GetProperty("name").GetString(), Is.EqualTo("Unlimited Deck"));
+        Assert.That(decks[0].GetProperty("deck_name").GetString(), Is.EqualTo("Unlimited Deck"));
     }
 
     [Test]
@@ -232,7 +232,7 @@ public class DeckControllerTests
         Assert.That(decks.GetArrayLength(), Is.EqualTo(2),
             "/deck/update should hand back the full refreshed list, saving the client a follow-up.");
         var names = Enumerable.Range(0, decks.GetArrayLength())
-            .Select(i => decks[i].GetProperty("name").GetString())
+            .Select(i => decks[i].GetProperty("deck_name").GetString())
             .ToList();
         Assert.That(names, Is.EquivalentTo(new[] { "Existing", "Second" }));
     }
@@ -252,7 +252,7 @@ public class DeckControllerTests
 
         var body = await response.Content.ReadAsStringAsync();
         using var doc = JsonDocument.Parse(body);
-        Assert.That(doc.RootElement.GetProperty("user_deck").GetProperty("name").GetString(),
+        Assert.That(doc.RootElement.GetProperty("user_deck").GetProperty("deck_name").GetString(),
             Is.EqualTo("New Name"));
 
         using var scope = factory.Services.CreateScope();
diff --git a/SVSim.UnitTests/Controllers/LoadControllerTests.cs b/SVSim.UnitTests/Controllers/LoadControllerTests.cs
index ebce139..ba1c008 100644
--- a/SVSim.UnitTests/Controllers/LoadControllerTests.cs
+++ b/SVSim.UnitTests/Controllers/LoadControllerTests.cs
@@ -17,24 +17,23 @@ public class LoadControllerTests
         """{"viewer_id":"0","steam_id":0,"steam_session_ticket":"","carrier":"steam","card_master_hash":""}""";
 
     /// <summary>
-    /// JSON keys (camelCased C# property names) for fields the client reads unconditionally.
-    /// These come from the plain-JSON path; the wire-format snake_case keys
-    /// (<c>user_rank</c>, <c>rotation_card_set_id_list</c>, ...) only apply when the
-    /// encrypted msgpack pipeline is in play — see <c>EncryptedPipelineTests</c> (Phase 6).
-    /// Missing any of these is a wire-shape regression in either path.
+    /// Wire keys (from <c>[Key("...")]</c> / mirrored <c>[JsonPropertyName]</c>) for fields the
+    /// client reads unconditionally in <c>LoadDetail.ConvertJsonData</c>. These are the names
+    /// the decompiled client actually looks up — NOT <c>SnakeCaseLower(C# property name)</c>.
+    /// Missing any of these crashes the client with <c>KeyNotFoundException</c> on /load/index.
     /// </summary>
     private static readonly string[] RequiredIndexKeys =
     {
-        "user_tutorial", "user_info", "user_currency", "user_items",
-        "user_rotation_decks", "user_unlimited_decks", "user_my_rotation_decks",
-        "user_cards", "user_classes", "sleeves", "user_emblems",
-        "user_degrees", "leader_skins", "my_page_backgrounds",
-        "user_rank_info", "user_ranked_matches", "daily_login_bonus", "arena_config",
-        "red_ether_overrides", "maintenance_cards", "arena_infos", "rank_info",
-        "class_exp", "loading_tip_card_exclusions", "default_settings",
-        "unlimited_ban_list", "rotation_sets",
-        "reprinted_cards", "spot_cards", "feature_maintenances",
-        "special_crystal_infos", "open_battlefield_ids", "loot_box_regulations",
+        "user_tutorial", "user_info", "user_crystal_count", "user_item_list",
+        "user_deck_rotation", "user_deck_unlimited", "user_deck_my_rotation",
+        "user_card_list", "user_class_list", "user_sleeve_list", "user_emblem_list",
+        "user_degree_list", "user_leader_skin_list", "user_mypage_list",
+        "user_rank", "user_rank_match_list", "daily_login_bonus", "challenge_config",
+        "red_ether_overwrite_list", "maintenance_card_list", "rank_info",
+        "class_exp", "loading_exclusion_card_list", "default_setting",
+        "unlimited_restricted_base_card_id_list", "rotation_card_set_id_list",
+        "reprinted_base_card_ids", "spot_cards", "feature_maintenance_list",
+        "special_crystal_info", "open_battle_field_id_list", "loot_box_regulation",
         "gathering_info", "user_config", "deck_format", "card_set_id_for_resource_dl_view"
     };
 
@@ -100,7 +99,7 @@ public class LoadControllerTests
 
         var root = await PostIndexAndReadBody(factory, viewerId);
 
-        Assert.That(root.GetProperty("user_rank_info").ValueKind, Is.EqualTo(JsonValueKind.Array));
+        Assert.That(root.GetProperty("user_rank").ValueKind, Is.EqualTo(JsonValueKind.Array));
     }
 
     [Test]
@@ -114,7 +113,7 @@ public class LoadControllerTests
 
         var root = await PostIndexAndReadBody(factory, viewerId);
 
-        Assert.That(root.GetProperty("user_rank_info").GetArrayLength(), Is.EqualTo(5));
+        Assert.That(root.GetProperty("user_rank").GetArrayLength(), Is.EqualTo(5));
     }
 
     [Test]
@@ -127,10 +126,26 @@ public class LoadControllerTests
 
         var root = await PostIndexAndReadBody(factory, viewerId);
 
-        Assert.That(root.GetProperty("rotation_sets").GetArrayLength(),
+        Assert.That(root.GetProperty("rotation_card_set_id_list").GetArrayLength(),
             Is.GreaterThanOrEqualTo(2));
     }
 
+    [Test]
+    public async Task Index_omits_arena_info_when_empty()
+    {
+        // ArenaData(JsonData) ctor reads data[0] inside the Keys.Contains("arena_info")
+        // branch (LoadDetail.cs:261 → ArenaData.cs:48) — an empty array crashes the client
+        // with ArgumentOutOfRangeException. Field must be absent when there's no arena.
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+
+        var root = await PostIndexAndReadBody(factory, viewerId);
+
+        Assert.That(root.TryGetProperty("arena_info", out _), Is.False,
+            "arena_info must be omitted when empty; the client crashes on []. " +
+            "If you re-add it, populate at least one entry with a valid format_info.");
+    }
+
     [Test]
     public async Task Index_when_viewer_has_no_decks_returns_empty_format_lists()
     {
@@ -141,15 +156,15 @@ public class LoadControllerTests
 
         var root = await PostIndexAndReadBody(factory, viewerId);
 
-        foreach (var key in new[] { "user_rotation_decks", "user_unlimited_decks", "user_my_rotation_decks" })
+        foreach (var key in new[] { "user_deck_rotation", "user_deck_unlimited", "user_deck_my_rotation" })
         {
             var container = root.GetProperty(key);
             Assert.That(container.ValueKind, Is.EqualTo(JsonValueKind.Object),
                 $"{key} should be the UserFormatDeckInfo object wrapper, not a raw array.");
-            var inner = container.GetProperty("user_decks");
+            var inner = container.GetProperty("user_deck_list");
             Assert.That(inner.ValueKind, Is.EqualTo(JsonValueKind.Array));
             Assert.That(inner.GetArrayLength(), Is.EqualTo(0),
-                $"{key}.userDecks must be an empty array for a deckless viewer, not null.");
+                $"{key}.user_deck_list must be an empty array for a deckless viewer, not null.");
         }
     }
 }
diff --git a/SVSim.UnitTests/Controllers/PracticeControllerTests.cs b/SVSim.UnitTests/Controllers/PracticeControllerTests.cs
index 61744ac..b026e89 100644
--- a/SVSim.UnitTests/Controllers/PracticeControllerTests.cs
+++ b/SVSim.UnitTests/Controllers/PracticeControllerTests.cs
@@ -58,9 +58,9 @@ public class PracticeControllerTests
         var rotation = doc.RootElement.GetProperty("user_deck_rotation");
         var unlimited = doc.RootElement.GetProperty("user_deck_unlimited");
         Assert.That(rotation.GetArrayLength(), Is.EqualTo(1));
-        Assert.That(rotation[0].GetProperty("name").GetString(), Is.EqualTo("Rotation Deck"));
+        Assert.That(rotation[0].GetProperty("deck_name").GetString(), Is.EqualTo("Rotation Deck"));
         Assert.That(unlimited.GetArrayLength(), Is.EqualTo(1));
-        Assert.That(unlimited[0].GetProperty("name").GetString(), Is.EqualTo("Unlimited Deck"));
+        Assert.That(unlimited[0].GetProperty("deck_name").GetString(), Is.EqualTo("Unlimited Deck"));
     }
 
     [Test]