I tried to pay for Hooktheory I and it showed Error 500

Hi @jackis, based on the screenshot, it looks like you used the “Pay With Card” option. Were you ever able to successfully checkout? We pushed an updated cart / checkout experience on Friday and it sounds like there may be a small bug that needs to be resolved.

Me too.Was trying to pay with PayPal but got the error 500 message.

There was a brief period with Paypal not working last week that has been resolved. Sometimes 500 errors happen when billing is rejected from bank too, but I suspect given the timing it was the aforementioned paypal outage that caused the message you saw (default payments through Stripe remained up during this period).