When using the Send to Messenger plugin, the optin.ref parameter is set by the data-ref field on the “Send to Messenger” plugin. This field can be used by the developer to associate a click event on the plugin with a callback.

Message Opt In Webhook Notification

Your app will receive opt in webhook notification when the following occurs:

A person opts-in

A person re-opts in by clicking the Continue messages button shown before the notification message token expires

A person changes their opt in status, stopping notifications or resuming notifications

{
  "sender": {
    "id": "PSID",
  },
  "recipient": {
    "id": "PAGE-ID",
  },
  "timestamp": "TIMESTAMP",
  "optin": {
    "type": "notification_messages",
    "payload": "ADDITIONAL-INFORMATION",
    "notification_messages_token": "NOTIFICATION-MESSAGES-TOKEN",
    "notification_messages_frequency": "FREQUENCY",
    "notification_messages_timezone": "TIMEZONE-ID",
    "token_expiry_timestamp": "TIMESTAMP",
    "user_token_status": "TOKEN-STATUS",
    "notification_messages_status": "NOTIFICATION-STATUS",
    "title": "TITLE"
    }
}

`optin`

Property	Description
`payload`string	Additional information that you want to include in the webhooks notification
`title` string	The title displayed in the template
`notification_messages_token`string	The token that represents the person who opted in, with the specific topic and message frequency, that is used to send Marketing Messages
`notification_messages_frequency` enum { `DAILY, WEEKLY, MONTHLY` }	The value can be one of the following: DAILY - send 1 notification per 24 hour period for 6 months from opt in date WEEKLY - send 1 notification per week for 9 months from the opt in date MONTHLY - send 1 notification per month for 12 months from the opt in date (Removed in API v16)
`notification_messages_timezone` string	Timezone for the person receiving the message
`notification_messages_status` enum { `STOP NOTIFICATIONS, RESUME NOTIFICATIONS` }	This field is present only when the user stops or resumes Marketing Messages. The value can be one of the following: STOP NOTIFICATIONS - User has clicked "Stop these messages" RESUME NOTIFICATIONS - User has clicked "Resume these messages"
`token_expiry_timestamp`unix timestamp	Date when the the notification message token expires
`type` string	Value must be `notification_messages`
`user_token_status` enum { `REFRESHED, NOT_REFRESHED` }	The value can be one of the following: REFRESHED - This is set when the user chooses to re opt-in to receiving Marketing Messages after the token has expired NOT_REFRESHED - Default value and is set when the user does not re opt-in to receiving Marketing Messages after the token has expired

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