[Feature] Add purchase notification (#2942)

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

@@ -0,0 +1,12 @@
+using Newtonsoft.Json;
+
+namespace Discord.API;
+
+internal class GuildProductPurchase
+{
+    [JsonProperty("listing_id")]
+    public ulong ListingId { get; set; }
+
+    [JsonProperty("product_name")]
+    public string ProductName { get; set; }
+}

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

@@ -105,6 +105,9 @@ internal class Message
     [JsonProperty("poll")]
     public Optional<Poll> Poll { get; set; }
 
+    [JsonProperty("purchase_notification")]
+    public Optional<MessagePurchaseNotification> PurchaseNotification { get; set; }
+  
     [JsonProperty("call")]
     public Optional<MessageCallData> Call { get; set; }
 }

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

@@ -0,0 +1,12 @@
+using Newtonsoft.Json;
+
+namespace Discord.API;
+
+internal class MessagePurchaseNotification
+{
+    [JsonProperty("type")]
+    public PurchaseType Type { get; set; }
+
+    [JsonProperty("guild_product_purchase")]
+    public Optional<GuildProductPurchase> ProductPurchase { get; set; }
+}

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

@@ -93,6 +93,9 @@ namespace Discord.Rest
         /// <inheritdoc />
         public MessageRoleSubscriptionData RoleSubscriptionData { get; private set; }
 
+        /// <inheritdoc />
+        public PurchaseNotification PurchaseNotification { get; private set; }
+        
         /// <inheritdoc />
         public MessageCallData? CallData { get; private set; }
 
@@ -276,9 +279,18 @@ namespace Discord.Rest
             if (model.Thread.IsSpecified)
                 Thread = RestThreadChannel.Create(Discord, new RestGuild(Discord, model.Thread.Value.GuildId.Value), model.Thread.Value);
 
+            if (model.PurchaseNotification.IsSpecified)
+            {
+                PurchaseNotification = new PurchaseNotification(model.PurchaseNotification.Value.Type,
+                    model.PurchaseNotification.Value.ProductPurchase.IsSpecified
+                        ? new GuildProductPurchase(model.PurchaseNotification.Value.ProductPurchase.Value.ListingId, model.PurchaseNotification.Value.ProductPurchase.Value.ProductName)
+                        : null);
+            }
+            
             if (model.Call.IsSpecified)
                 CallData = new MessageCallData(model.Call.Value.Participants, model.Call.Value.EndedTimestamp.ToNullable());
         }
+        
         /// <inheritdoc />
         public async Task UpdateAsync(RequestOptions options = null)
         {