These fields are optional for refunding a gift card redemption:
buyerInformation.merchantCustomerId
clientReferenceInformation.transactionId
merchantDefinedInformation[].key and merchantDefinedInformation[].value
merchantInformation.transactionLocalDateTime
orderInformation.billTo.postalCode
orderInformation.invoiceDetails.clerkId
orderInformation.merchantDescriptor.country
paymentInformation.card.isEscheatable
pointOfSaleInformation.terminalId
processingInformation.reconciliationId
processingInformation.reportGroup
Supported for card-present only.
processingInformation.transactionPostDate