Added proper JsonPropertyNames.

DiscordClient/Data/ChannelMessagesResponse.cs

@@ -1,3 +1,22 @@
+using System.Text.Json.Serialization;
+
 namespace DiscordClient.Data;
 
-public class ChannelMessagesResponse { }
+[JsonUnmappedMemberHandling(JsonUnmappedMemberHandling.Skip)]
+public class ChannelMessagesResponse
+{
+    [JsonPropertyName("id")]
+    public string Id { get; set; }
+
+    [JsonPropertyName("type")]
+    public int Type { get; set; }
+
+    [JsonPropertyName("content")]
+    public string Content { get; set; }
+
+    [JsonPropertyName("channel_id")]
+    public string ChannelId { get; set; }
+
+    [JsonPropertyName("author")]
+    public MessageAuthor Author { get; set; }
+}

DiscordClient/Data/MessageAuthor.cs

@@ -0,0 +1,15 @@
+using System.Text.Json.Serialization;
+
+namespace DiscordClient.Data;
+
+public class MessageAuthor
+{
+    [JsonPropertyName("id")]
+    public string Id { get; set; }
+
+    [JsonPropertyName("username")]
+    public string Username { get; set; }
+
+    [JsonPropertyName("global_name")]
+    public string GlobalName { get; set; }
+}