Facebook developer account
Overview
In order to use Facebook integrations which require a facebook app or Facebook access tokens, you need to get a Facebook Developer account. (This requires you to first have a normal Facebook account.)
Getting a Facebook Developer account
To sign up as a Facebook Developer:

Click Get Started and log in with the relevant account.

(You can also create a new account here)
Now you are going to Create a Meta for Developers account

Click on Continue
Provide your country and the mobile data to verify

Confirm your email address

Select the role that describe you and complete the registration.

Now you are all set.