Googler, opinions are my own. I work on payments.

Have you tried contacting payments or the related product support to ask? https://support.google.com/paymentscenter/?hl=en#topic=90175...

We do a lot to make sure credit cards work all around the world (like we kept supporting cards in India when Apple pulled out due to certain regulations). There could be some issue with your account or card. I could maybe look if you contacted me, but likely I couldn't reply at all.