Refunds can be sent back only to the original payment method used in a charge. It’s not possible to send a refund to a different destination (e.g., another card or bank account).
Refunds to expired or cancelled cards are handled by the customer’s card issuer and, in most cases, credited to the customer’s replacement card. If no replacement exists, the card issuer usually delivers the refund to the customer using an alternate method (e.g., check or bank account deposit). In rare cases, a refund back to a card may fail.