handling-facebook-webhook.md

#Handling Facebook Webhook

Facebook Messenger Platform supports webhook vis Postback button

Recime bots handles facebook webhook therefore developers can handle specific logic due to user actions. The following is the very basic implementation of facebook postback (main.js):

export class Bot {
  constructor(args){
    this.args = args;
  }

  execute(){
    let args = this.args;
    let postback = args.rawBody.postback;

    return new Promise((resolve, reject)=>{
        if (postback){
          resolve({
            "text" : "We have received your request."
          });
        } else {
          resolve({
            "attachment":{
              "type":"template",
              "payload":{
                "template_type":"button",
                "text":"What do you want to do next?",
                "buttons":[
                  {
                    "type":"postback",
                    "title":"Start Chatting",
                    "payload":JSON.stringify({
                      "userID" : "12334"
                    })
                  }
                ]
              }
            }
          });   
        }
    });
  }
}

postback contains the payload data, here in this case it’s the userID. To know more on postback and webhook, we would recommend to checkout the following reference from the Facebook Messenger Platform documentation:

https://developers.facebook.com/docs/messenger-platform/send-api-reference/postback-button