Refund the total amount of an invoice (specified by Invoice ID) with empty body, or partial refund by providing a body with the amount.
Upon successful refund, the refunds array will contain an item with "responseMessage": "Approved". You can pay attention also to the invoiceStatus field, if the refund was successful, the status of the invoice will be “Refund” or “PartialRefund".
If the refund amount exceeds the remaining amount for the refund, or an invalid field or value is submitted, then a status code of 400 (Bad Request) will be returned.
If the Invoice ID cannot be associated with an active invoice, a status of 404 (Not Found) will be returned.
If the refund cannot be completed, the operation will return a status of 422 (Unprocessable Entity).
Refunds potentially might not be completed because of an invalid payment method e.g. a deleted payment method or the payment processor rejected the refund.