resolved #88

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

@@ -18,7 +18,7 @@ namespace Discord.API
 
         // New flags prop. this make the response "ephemeral". see https://discord.com/developers/docs/interactions/slash-commands#interaction-response-interactionapplicationcommandcallbackdata
         [JsonProperty("flags")]
-        public Optional<int> Flags { get; set; }
+        public Optional<MessageFlags> Flags { get; set; }
 
         [JsonProperty("components")]
         public Optional<API.ActionRowComponent[]> Components { get; set; }

src/Discord.Net.Rest/API/Rest/CreateWebhookMessageParams.cs

@@ -28,7 +28,7 @@ namespace Discord.API.Rest
         public Optional<AllowedMentions> AllowedMentions { get; set; }
 
         [JsonProperty("flags")]
-        public Optional<int> Flags { get; set; }
+        public Optional<MessageFlags> Flags { get; set; }
 
         [JsonProperty("components")]
         public Optional<API.ActionRowComponent[]> Components { get; set; }

src/Discord.Net.WebSocket/Discord.Net.WebSocket.xml

@@ -3628,14 +3628,8 @@
         <member name="M:Discord.WebSocket.SocketMessageComponent.FollowupAsync(System.String,Discord.Embed[],System.Boolean,System.Boolean,Discord.AllowedMentions,Discord.RequestOptions,Discord.MessageComponent,Discord.Embed)">
             <inheritdoc/>
         </member>
-        <member name="M:Discord.WebSocket.SocketMessageComponent.DeferAsync(Discord.RequestOptions)">
-            <summary>
-                Acknowledges this interaction with the <see cref="F:Discord.InteractionResponseType.DeferredUpdateMessage"/>.
-            </summary>
-            <param name="options">The request options for this async request.</param>
-            <returns>
-                A task that represents the asynchronous operation of acknowledging the interaction.
-            </returns>
+        <member name="M:Discord.WebSocket.SocketMessageComponent.DeferAsync(System.Boolean,Discord.RequestOptions)">
+            <inheritdoc/>
         </member>
         <member name="T:Discord.WebSocket.SocketMessageComponentData">
             <summary>
@@ -3747,13 +3741,8 @@
         <member name="M:Discord.WebSocket.SocketSlashCommand.FollowupAsync(System.String,Discord.Embed[],System.Boolean,System.Boolean,Discord.AllowedMentions,Discord.RequestOptions,Discord.MessageComponent,Discord.Embed)">
             <inheritdoc/>
         </member>
-        <member name="M:Discord.WebSocket.SocketSlashCommand.DeferAsync(Discord.RequestOptions)">
-            <summary>
-                Acknowledges this interaction with the <see cref="F:Discord.InteractionResponseType.DeferredChannelMessageWithSource"/>.
-            </summary>
-            <returns>
-                A task that represents the asynchronous operation of acknowledging the interaction.
-            </returns>
+        <member name="M:Discord.WebSocket.SocketSlashCommand.DeferAsync(System.Boolean,Discord.RequestOptions)">
+            <inheritdoc/>
         </member>
         <member name="T:Discord.WebSocket.SocketSlashCommandData">
             <summary>
@@ -3888,10 +3877,12 @@
                 A task that represents the asynchronous operation of acknowledging the interaction.
             </returns>
         </member>
-        <member name="M:Discord.WebSocket.SocketInteraction.DeferAsync(Discord.RequestOptions)">
+        <member name="M:Discord.WebSocket.SocketInteraction.DeferAsync(System.Boolean,Discord.RequestOptions)">
             <summary>
                 Acknowledges this interaction.
             </summary>
+            <param name="ephemeral"><see langword="true"/> to send this message ephemerally, otherwise <see langword="false"/>.</param>
+            <param name="options">The request options for this async request.</param>
             <returns>
                 A task that represents the asynchronous operation of acknowledging the interaction.
             </returns>

src/Discord.Net.WebSocket/Entities/Interaction/Message Components/SocketMessageComponent.cs

@@ -123,7 +123,7 @@ namespace Discord.WebSocket
             };
 
             if (ephemeral)
-                response.Data.Value.Flags = 64;
+                response.Data.Value.Flags = MessageFlags.Ephemeral;
 
             await InteractionHelper.SendInteractionResponse(this.Discord, response, this.Id, Token, options);
         }
@@ -180,7 +180,7 @@ namespace Discord.WebSocket
                     Components = args.Components.IsSpecified
                         ? args.Components.Value?.Components.Select(x => new API.ActionRowComponent(x)).ToArray()
                         : Optional<API.ActionRowComponent[]>.Unspecified,
-                    Flags = args.Flags.IsSpecified ? (int?)args.Flags.Value ?? Optional<int>.Unspecified : Optional<int>.Unspecified
+                    Flags = args.Flags.IsSpecified ? args.Flags.Value ?? Optional<MessageFlags>.Unspecified : Optional<MessageFlags>.Unspecified
                 }
             };
 
@@ -217,23 +217,19 @@ namespace Discord.WebSocket
             };
 
             if (ephemeral)
-                args.Flags = 64;
+                args.Flags = MessageFlags.Ephemeral;
 
             return await InteractionHelper.SendFollowupAsync(Discord.Rest, args, Token, Channel, options);
         }
 
-        /// <summary>
-        ///     Acknowledges this interaction with the <see cref="InteractionResponseType.DeferredUpdateMessage"/>.
-        /// </summary>
-        /// <param name="options">The request options for this async request.</param>
-        /// <returns>
-        ///     A task that represents the asynchronous operation of acknowledging the interaction.
-        /// </returns>
-        public override Task DeferAsync(RequestOptions options = null)
+        /// <inheritdoc/>
+        public override Task DeferAsync(bool ephemeral = false, RequestOptions options = null)
         {
             var response = new API.InteractionResponse()
             {
                 Type = InteractionResponseType.DeferredUpdateMessage,
+                Data = ephemeral ? new API.InteractionCallbackData() { Flags = MessageFlags.Ephemeral } : Optional<API.InteractionCallbackData>.Unspecified
+
             };
 
             return Discord.Rest.ApiClient.CreateInteractionResponse(response, this.Id, this.Token, options);

src/Discord.Net.WebSocket/Entities/Interaction/Slash Commands/SocketSlashCommand.cs

@@ -106,7 +106,7 @@ namespace Discord.WebSocket
             };
 
             if (ephemeral)
-                response.Data.Value.Flags = 64;
+                response.Data.Value.Flags = MessageFlags.Ephemeral;
 
             await InteractionHelper.SendInteractionResponse(this.Discord, response, this.Id, Token, options);
         }
@@ -141,22 +141,18 @@ namespace Discord.WebSocket
             };
 
             if (ephemeral)
-                args.Flags = 64;
+                args.Flags = MessageFlags.Ephemeral;
 
             return await InteractionHelper.SendFollowupAsync(Discord.Rest, args, Token, Channel, options);
         }
 
-        /// <summary>
-        ///     Acknowledges this interaction with the <see cref="InteractionResponseType.DeferredChannelMessageWithSource"/>.
-        /// </summary>
-        /// <returns>
-        ///     A task that represents the asynchronous operation of acknowledging the interaction.
-        /// </returns>
-        public override Task DeferAsync(RequestOptions options = null)
+        /// <inheritdoc/>
+        public override Task DeferAsync(bool ephemeral = false, RequestOptions options = null)
         {
             var response = new API.InteractionResponse
             {
                 Type = InteractionResponseType.DeferredChannelMessageWithSource,
+                Data = ephemeral ? new API.InteractionCallbackData() { Flags = MessageFlags.Ephemeral } : Optional<API.InteractionCallbackData>.Unspecified
             };
 
             return Discord.Rest.ApiClient.CreateInteractionResponse(response, this.Id, this.Token, options);

src/Discord.Net.WebSocket/Entities/Interaction/SocketInteraction.cs

@@ -156,15 +156,17 @@ namespace Discord.WebSocket
         ///     A task that represents the asynchronous operation of acknowledging the interaction.
         /// </returns>
         [Obsolete("This method deprecated, please use DeferAsync instead")]
-        public Task AcknowledgeAsync(RequestOptions options = null) => DeferAsync(options);
+        public Task AcknowledgeAsync(RequestOptions options = null) => DeferAsync(options: options);
 
         /// <summary>
         ///     Acknowledges this interaction.
         /// </summary>
+        /// <param name="ephemeral"><see langword="true"/> to send this message ephemerally, otherwise <see langword="false"/>.</param>
+        /// <param name="options">The request options for this async request.</param>
         /// <returns>
         ///     A task that represents the asynchronous operation of acknowledging the interaction.
         /// </returns>
-        public abstract Task DeferAsync(RequestOptions options = null);
+        public abstract Task DeferAsync(bool ephemeral = false, RequestOptions options = null);
 
         private bool CheckToken()
         {