post https://staging-pyxisapi.csipay.com/PyxisMasterApi/api/refund
The refund API returns the amount of a previous sale to the account specified in the sale. The transaction Id from the sale must be provided.
IMPORTANT NOTE ON PARTIAL REFUNDS: Partial refunds can be requested in certain circumstances and with certain configurations. Your partner configuration must allow them and the processing gateway that will be used for a transaction must allow it.