I have a site that is taking registrations for a local photography symposium. People can register for the events they wish to attend and then they are given the option to pay via paypal. It works perfectly as long as they pay at that point. The issue becomes when they don't pay right a way and then contact me for an invoice to pay.
I can go to PayPal and generate an invoice but that doesn't tie back to the registration. Is there a way once a person has registered to send them an email with a PayPal invoice link based on what they ordered that will update the entry when paid. In the same fashion as if they had completed the transaction at the time of registration?