Maria Adams, Credit Cards Moderator
@m_adams
A credit balance refund on the American Express Platinum card is a reimbursement for paying more than the total balance owed on the card. For example, a cardholder who has a balance of $500, but pays $600, can get a credit balance refund of the $100 that they overpaid.
Cardholders can request an American Express Platinum card credit balance refund: by phone 1-800-528-4800, online or by sending a written request to American Express / P.O. Box 981535 / El Paso, TX 79998-1535. They can get their refund in the form of a check. Legally, a card issuer is obligated to issue a credit balance refund within seven business days of your request for one.
Please note that you are not required to request a credit balance refund if you overpay your American Express Platinum card. If you have a negative balance on your account, meaning you've paid more than you owe, future purchases will be credited until the balance is back to zero. If you maintain a negative credit balance for six months, American Express is required to offer you a refund.

The Platinum Card® from American Express
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