Facebook Webhook Setup
Webhooks setup
Go to https://developers.facebook.com/apps/<app-id>/webhooks/
and add (or edit) webhook subscription with the following url
# HTTPS is required
https://reports.aleteia.org/realtime_updates
Then subscribe for leadgen field change using the FB interface using version 2.9 of api.
Once everything is done go to https://reports.aleteia.org/realtime_updates/setup and link the pages to the app you want to receive updates.
Then you must configure processors, every page can have multiple forms and multiples list attached.
You then can test that the integration is working using these tools https://developers.facebook.com/docs/marketing-api/guides/lead-ads/testing-troubleshooting/v2.9