I can't use PayPal or crypto, and the "card" option requires an American format.
Dimond?

There are some articles that may be helpful:
https://support.chess.com/category/135-membership-and-billing
Or contact support directly:
https://support.chess.com/article/346-contact-us
Or go to the bottom left of your screen and click "ask a question"
I tried to upgrade to Dimond, can anyone pls help?
(I'm Chinese.)