I put in the npub, I get a menu selecting Bitcoin or Credit Card, I select Credit Card, then I get the above.
Surely you must have some server logs to peruse.
Heh - we actually don’t log invalid form submission there because crawlers do it constantly. I can re-deploy it with temp logging there if we absolutely have to.
I put in your npub and I get the credit card page without any issues for several devices and different browsers.
If you’re using an nprofile or something instead of a valid npub - that would explain the error so thats why I asked.