Enable sending ephemeral messages to Slack

src/API.php

@@ -33,6 +33,7 @@ final class API
 	private const scopes = [
 		'auth.test'=>'',                                // No scope required
 		'chat.delete'=>'chat:write',
+		'chat.postEphemeral'=>'chat:write',
 		'chat.postMessage'=>'chat:write',
 		'chat.update'=>'chat:write',
 		'conversations.history'=>'channels:history',    // Also need groups:history for Private Channels and im:history for messages to the bot.
@@ -216,6 +217,20 @@ final class API
 		return new Generic($this->execute('pins.add',json_encode(['channel'=>$channel,'timestamp'=>$timestamp])));
 	}
 
+	/**
+	 * Post a Slack Message to a user as an ephemeral message
+	 *
+	 * @param Message $request
+	 * @return Generic
+	 * @throws \Exception
+	 */
+	public function postEphemeral(Message $request): Generic
+	{
+		Log::debug(sprintf('%s:Post a Slack Ephemeral Message',static::LOGKEY),['m'=>__METHOD__,'r'=>$request]);
+
+		return new Generic($this->execute('chat.postEphemeral',json_encode($request)));
+	}
+
 	/**
 	 * Post a Slack Message
 	 *