Here is more info
https://developers.facebook.com/docs/messenger-platform/send-api-reference/postback-button
Here is more info
https://developers.facebook.com/docs/messenger-platform/send-api-reference/postback-button
Got my answer here!
https://community.flowxo.com/t/how-to-get-the-postback-data-from-facebook-messenger-bot/795
Will search next time