To connect your P2P Platform with Facebook we need a Facebook App ID and the App Secret.
Please follow this instruction from auth0.com for Step 1 to 5:
Step 3: valid OAuth redirect URLs
Important is the setting for the callback URL: https://DOMAIN.eu.auth0.com/login/callback
Step 5: App Domain
Please enter the URL of your P2P platform (Test URL and live URL). If you get an error message, click on "Add Platform" and add a Website.
Once you are done with the instruction please send the App ID and the App Secret back to RaiseNow.