[Feature] Add new message types & error codes (#2562)

* Add new message types & error codes

* add role subscription system channel flags and message property

src/Discord.Net.Rest/API/Common/Message.cs

@@ -62,5 +62,7 @@ namespace Discord.API
         public Optional<MessageInteraction> Interaction { get; set; }
         [JsonProperty("sticker_items")]
         public Optional<StickerItem[]> StickerItems { get; set; }
+        [JsonProperty("role_subscription_data")]
+        public Optional<MessageRoleSubscriptionData> RoleSubscriptionData { get; set; }
     }
 }

src/Discord.Net.Rest/API/Common/MessageRoleSubscriptionData.cs

@@ -0,0 +1,18 @@
+using Newtonsoft.Json;
+
+namespace Discord.API;
+
+internal class MessageRoleSubscriptionData
+{
+    [JsonProperty("role_subscription_listing_id")]
+    public ulong SubscriptionListingId { get; set; }
+
+    [JsonProperty("tier_name")]
+    public string TierName { get; set; }
+
+    [JsonProperty("total_months_subscribed")]
+    public int MonthsSubscribed { get; set; }
+
+    [JsonProperty("is_renewal")]
+    public bool IsRenewal { get; set; }
+}

src/Discord.Net.Rest/Entities/Messages/RestMessage.cs

@@ -80,6 +80,9 @@ namespace Discord.Rest
         /// <inheritdoc/>
         public MessageType Type { get; private set; }
 
+        /// <inheritdoc />
+        public MessageRoleSubscriptionData RoleSubscriptionData { get; private set; }
+
         /// <inheritdoc/>
         public IReadOnlyCollection<ActionRowComponent> Components { get; private set; }
         /// <summary>
@@ -243,6 +246,15 @@ namespace Discord.Rest
                     _userMentions = newMentions.ToImmutable();
                 }
             }
+
+            if (model.RoleSubscriptionData.IsSpecified)
+            {
+                RoleSubscriptionData = new(
+                    model.RoleSubscriptionData.Value.SubscriptionListingId,
+                    model.RoleSubscriptionData.Value.TierName,
+                    model.RoleSubscriptionData.Value.MonthsSubscribed,
+                    model.RoleSubscriptionData.Value.IsRenewal);
+            }
         }
         /// <inheritdoc />
         public async Task UpdateAsync(RequestOptions options = null)