Remember your heroku ID and app address. ex:
Make sure you already have Facebook account, if you need use FB Bot.
Create App, need select as follow:
Get token from Faccebook page.
Go to heroku dashboard, go to "Setting" -> "Config Variables".
https://APP_ADDRESS.herokuapp.com/webhookin callback URL.
If your configuration is correct, it will show "completed".
Also remember to choose correct page in this setting.
In Messenger application review, press "Request Premission".
main.gofirst. especially in
git push heroku master.
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