I tried Paypal last year and for some reason it stopped taking payments half way through the registration period. They had me work with a team of engineers and

I tried Paypal last year and for some reason it stopped taking payments half way through the registration period. They had me work with a team of engineers and it turns out it was some gnarly bug on their end, so I spent like 30 hours debugging their bug for them. I can't go back to that. We'll process something like < $30k so there aren't really many options for that. Invoices are too annoying to deal with for a few hundred participants.