Add scheduled messages

src/API.php

@@ -40,6 +40,8 @@ class API
 		'dialog.open'=>'',                              // No scope required
 		'pins.add'=>'pins:write',
 		'pins.remove'=>'pins:write',
+		'chat.scheduleMessage'=>'chat:write',
+		'chat.scheduledMessages.list'=>'',
 		'team.info'=>'team:read',
 		'views.open'=>'',                               // No scope required
 		'views.publish'=>'',                            // No scope required
@@ -226,6 +228,34 @@ class API
 		return new Generic($this->execute('chat.postMessage',json_encode($request)));
 	}
 
+	/**
+	 * Schedule a slack message
+	 *
+	 * @param Message $request
+	 * @return Generic
+	 * @throws \Exception
+	 */
+	public function scheduleMessage(Message $request): Generic
+	{
+		Log::debug(sprintf('%s:Scheduling a Slack Message',static::LOGKEY),['m'=>__METHOD__,'r'=>$request]);
+
+		return new Generic($this->execute('chat.scheduleMessage',json_encode($request)));
+	}
+
+	/**
+	 * Get the scheduled messages
+	 *
+	 * @param Message $request
+	 * @return Generic
+	 * @throws \Exception
+	 */
+	public function scheduleMessagesList(string $request=NULL): Generic
+	{
+		Log::debug(sprintf('%s:Get the Scheduled Messages in Slack',static::LOGKEY),['m'=>__METHOD__,'r'=>$request]);
+
+		return new Generic($this->execute('chat.scheduledMessages.list',$request ? ['channel'=>$request] : []));
+	}
+
 	/**
 	 * Remove a Pin from a message
 	 *

src/Message.php

@@ -150,6 +150,22 @@ class Message implements \JsonSerializable
 		return $response;
 	}
 
+	/**
+	 * Schedule a message
+	 *
+	 * @param Carbon $time
+	 * @return Generic
+	 */
+	public function schedule(Carbon $time): Generic
+	{
+		$this->_data->put('post_at',$time->timestamp);
+
+		$api = $this->o->team->slackAPI();
+		$response = $this->_data->has('ts') ? $api->updateMessage($this) : $api->scheduleMessage($this);
+
+		return $response;
+	}
+
 	public function setReplace(bool $replace=TRUE): self
 	{
 		$this->_data->put('replace_original',$replace ? 'true' : 'false');

src/Response/Base.php

@@ -51,6 +51,7 @@ class Base extends SlackBase implements \JsonSerializable
 				return object_get($this->_data,$key) ?: object_get($this->_data,'channel');
 
 			case 'messages':                        // Used by getMessageHistory()
+			case 'scheduled_messages':				// Used by scheduledMessagesList()
 				return collect(object_get($this->_data,$key));
 
 			case 'team_id':