code: public void sendQuickReplyPayload(String payload) {
  		MessageEnvelope envelope = new MessageEnvelope();
  		QuickReply quickReply = new QuickReply("Sample", payload);
  
  		ReceivedMessage message = new ReceivedMessage();
  		message.setQuickReply(quickReply);
  		envelope.setMessage(message);
  		envelope.setSender(new User(facebookMockId));
  
  		System.out.println("Sending quick reply: [" + message + "] as user : ["
  				+ facebookMockId + "].");
  		forward(envelope);
  		System.out.println("Sent!");
  	}
docs: Sends a quickreply to all the registered bots. Used to simulate a user
  interacting with buttons.
  
  @param payload
  the payload to send.