finally it closes and the final stage is "We were unable to authorize your card.", back on the payment details page. no authentication pops up on my phone from my banking app.
First step, contact the card account directly (VISA,Mastercard,bank) and make sure they don't have it flagged as a suspicious transaction, that works for me. If that doesn't work, I'm really not sure what to tell you. You could buy a different form of donation method and see if that works, if you do make sure it's at a reputable business (the actual store) and one you would use IF, by some odd luck, that isn't accepted either.