If anyone from Khan Academy is reading this: I tried to donate and my transaction was flagged as "suspicious", now my card is blocked. Probably because their PSP doesn't seem to implement 3DSecure. What's grating is that after I tried to donate I had to solve a bunch of reCaptchas before it showed me the failure status.
Very likely Khan Academy can't help. Also your bank probably doesn't know why and neither does their fraud prevention service provider that runs some machine learning/AI system somewhere that decided to flag your transaction. At least that has been my experience in dealing with these things.
I had a similar experience now. Never had to do reCaptcha on a payment form with my phone before. And then the payment was rejected. I am a normal US credit card payer. I ended up using PayPal.
