This event will be sent to your webhook when a user reacts to a message on Messenger.
You can subscribe to this callback by selecting the message_reactions field when setting up your webhook.

Example

{
   "sender":{
      "id":"<PSID>"
   },
   "recipient":{
      "id":"<PAGE_ID>"
   },
   "timestamp":1458668856463,
   "reaction":{
         "reaction": "smile|angry|sad|wow|love|like|dislike|other",
         "emoji": "\u{2764}\u{FE0F}",
         "action": "react|unreact",
         "mid": "<MID_OF_ReactedTo_Message>",
   }
}

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

`reaction`

Property	Type	Description
`reaction`	string	Text description of the reaction. Possible values: `smile`, `angry`, `sad`, `wow`, `love`, `like`, `dislike`. `other` could also be returned in case the emoji based reaction does not match the ones above.
`emoji`	UTF-8 Emoji	Reference to the emoji corresponding to the reaction.
`action`	string	Action performed by the user. Possible values: `react`, `unreact`
`mid`	string	Reference to the Message ID that the user reacted performed the reaction on.

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