This callback will occur when a message a Page has sent has been delivered. You can subscribe to this callback by selecting the message_deliveries field when setting up your webhook.

Example

{
  "sender":{
    "id":"<PSID>"
  },
  "recipient":{
    "id":"<PAGE_ID>"
  },
   "delivery":{
      "mids":[
         "mid.1458668856218:ed81099e15d3f4f233"
      ],
      "watermark":1458668856253
   }
}

Properties

`sender`

`sender` Field	Description
`id` string	The Page-scoped ID for the person who sent a message to your business

`recipient`

`recipient` Field	Description
`id` string	The ID for your Facebook Page

`delivery`

Property	Type	Description
`mids`	Array<String>	Array containing message IDs of messages that were delivered. Field may not be present.
`watermark`	Number	All messages that were sent before this timestamp were delivered

Both mids and watermark fields are used to determine which messages were delivered. watermark is always present and mids is sometimes present. mids provides delivery receipts on a per-message basis but may not be present (due to backward compatibility reasons with older Messenger clients). watermark is always present and is a timestamp indicating that all messages with a timestamp before watermark were delivered.

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