Logging into ZAM and checking out the Premium Services FAQ they have this:
How do I change my billing information?
A new credit card could be a change in credit card or a new expiration date, either way is the same. Once the current subscription expires, reapply for premium with the new information. This is for your security that we do not allow changes to billing information. If you have physically moved and have a new address, on the Premium Information tab there is a link for Change Billing Address click that and fill in the new information.
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