can't change my payment method in asset store

My old credit card expires. But I can’t purchase in unity asset store with another credit card or paypal now. Whatever card I use, I always get the message “your transaction is declined”. I tried couple of time to make sure my new card information is correct. If I switch to paypal, there is no place to input my paypal account, and I get the same message. Please help.

Sounds like you should get in touch with Unity support directly:

I’m letting this question through the moderation queue, just in case, but the volunteers here probably won’t be able to help you.