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messaging_postbacks Webhooks Reference

This document explains the JSON payload your webhooks server will receive when a messaging postback webhook event is triggered. A postback webhook event is triggered when a person clicks a postback button, Get Started button, or persistent menu item.

Example Notification

The following is an example of the JSON payload that will be sent to your webhooks server.

{
  "field": "messaging_postbacks",
  "value": {
    "sender": {
      "user_ref": "USER-REF-ID"
    },
    "recipient": {
      "id": "PAGE-ID"
    },
    "timestamp": "1527459824",
    "postback": {
      "mid": "m_MESSAGE-ID",
      "title": "TITLE-FOR-THE-CTA",
      "payload": "USER-DEFINED-PAYLOAD",
      "referral": {
        "ref": "USER-DEFINED-REFERRAL-PARAM",
        "source": "SHORT-URL",
        "type": "OPEN_THREAD"
      }
    }
  }
}

JSON Properties

All JSON properties in a webhook notification are strings.

PropertyDescription

postback.mid

The ID for the message

postback.payload

Information defined in the CTA payload parameter. This is only included in the webhook notification sent to the app that sent the message to the person.

postback.referral

Information about the action the person took to enter a conversation.

The referral property information is included in the webhook notification only when a person starts a conversation using one of the following then clicking a CTA such as a Get Started button:

  • A Chat Plugin
  • An m.me Link
  • A Click to Messenger Ad
  • A Messenger QR Code
  • A Welcome Screen

postback.referral.ref

The arbitrary data that was originally passed in the ref param added to the m.me link. Only alphanumeric characters as well as -, _, and = are supported

postback.referral.source

The URL for this referral. For m.me links, the value of source is “SHORTLINK”. For referrals from Messenger Conversation Ads, the value of source is "ADS"

postback.referral.type

The identifier for the referral. For referrals coming from m.me links, it will always be "OPEN_THREAD".

postback.title

The title for the Call To Action (CTA) that a person clicked

recipient.id

The ID for your Facebook Page

sender.user_ref

The ID for the reference for a person who took an action, such as clicked a Get Started, Chat Plugin or Persistent Menu item, that sent a message

timestamp

The Unix timestamp for date when the webhook notification was sent to your server

See Also

Additional developer documentation to further your understanding of concepts mentioned in this Messaging Postbacks Webhooks guide.