Pay Per View - Facebook Integration Issue

Having an issue with Pay Per View and Facebook integration. Google Integration works fine. The issue I'm having is after someone signs in with Facebook, they are not redirected to Paypal to complete the transaction. I double checked that I have the correct Facebook app ID. I'm not sure if I need to include additional redirect URIs. I don't run any other Facebook integration, so I don't have the "Do Not load Facebook script" off. Thanks in advance.