I've tried twice to donate with a credit card (Visa) and it has rejected it both times. I used to donate with paypal but I am dropping paypal and I don't want to use it. What am I doing wrong?

I stopped using paypal after getting charged £30 for a pizza I never even ordered and then years of trying to sort out my account so I could actually buy something. However I now use it since they started just taking debit card transactions like everyone else.