Having had Buy Me A Coffee promeniently featured on two websites and a newsletter I never had anyone actually contribute a penny. YMMV of course but with a quarter of a million page views you'd think people would have contributed at least once.
“We were unable to process your payment right now !
If you encounter this message more than once, please contact support for further assistance Or you can try again“
Went through the whole process again with the same card, didn’t work. Same error.
Went through the whole process again with a different card. Still didn’t work. Same non-descript error.
So your account in particular may be blacklisted or broken for some reason :-(
Sorry, no coffee for you!