Facebook Messenger bot not sending messages in order

Question

I\'m playing around with building a simple Facebook Messenger chatbot and I\'m having trouble sending messages in sequence.

In the example above, it should

Answer 1

Implement the send request as a Promise and only send consequent messages once the previous one is resolved

const send = (userId, messageData)  => {

      return new Promise((resolve, reject) => {
        request
        (
            {
                url     : BASE_URL + "me/messages",
                qs      : { access_token : PAGE_ACCESS_TOKEN },
                method  : "POST",
                json    : 
                        {
                            recipient: { id : userId },
                            message: messageData,
                        }
            }, (error, response, body) => 
            {
                if (error) { console.log("Error sending message: " + response.error); return reject(response.error); }
                else if (response.body.error) { console.log('Response body Error: ' + response.body.error); return reject(response.body.error); }

                console.log("Message sent successfully to " + userId); 
                return resolve(response);
            }
        );    
    });
};