GiftCardSale is used to redeem value from a stored value account.
Note: Partial approvals are supported by default. If the account balance is non-zero but insufficient to cover the full redemption amount, the remaining balance is drained and the amount still owed is returned in the response for additional payment. The merchant may accept any additional tender to cover the amount still owed. If the account holder is unable to provide additional payment and the purchase is cancelled, this transaction should be voided to return the balance back to the account. See the "split tender card amount" and "split tender balance due amount" fields in the response.