email address is not match

so i try to buy zp on this account. i am using my mom's credit card, because she gave me permission. i fill out all of the information correctly, and click "buy". after that point, it says "transaction has been voided. your credit card will NOT be charged. reason: email address is not match"

what does that even mean? email address is not match? pro translators are pro.

anyways, does anyone know how i can solve this issue?

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