Facebook Messenger FastAPI

Create environments with Python3.7

Install reqiments

  pip install -r requirements.txt

Convert env.example to .env and fullfill the variables

FB_APP_SECRET=
FB_VERIFY_TOKEN=
FB_PAGE_ACCESS_TOKEN=

for collecting this three variable you have to follow the boelow steps

1. Visit a facebook page
2. Visit https://developers.facebook.com/apps/?show_reminder=true
3. If you don't have account on developers facebook then create account
4. Create an new app on https://developers.facebook.com/apps/?show_reminder=true
5. FB_APP_SECRET is find to Dashboard->Setting->Basic (App Secret)
6. Click on products then setup Messenger
7. You got FB_PAGE_ACCESS_TOKEN from ->
   Go to Access Tokens section and click on the Add or remove page then click on Generate Token Button copy this token.
8. FB_VERIFY_TOKEN is a random token more than 8 char
9. You collected all three variable required for you project

Run this project using:

uvicorn app.main:app --reload

Finally we run this project. But for testing the bot we need to add callback url to messenger app setting Webhooks section. One problem arise hare. For callback url you need a secure url like https.

You need to download Ngrok from here: https://ngrok.com/download

Go to the downloaded folder using teminal and type:

./ngrok http 8000

It will generate 2 links one is http and another one is https. Just copy the https link.

Now we are ready with our https secure url. Go to the app deshboard Messenger ->Setting ->Webhook and add the Callback URL as

https link from ngrok/webhook

example:

https://6a42d3b4.ngrok.io/webhook

Verify Token is the same of FB_VERIFY_TOKEN

then click on Varify and Save

Now you can send message from your messener to your facebook page inbox