When you perform a transaction, you will receive a YocoPaymentResponse object that contains a YocoReceiptDetails object (
receiptDetails). In order to process a refund you will need to pass in the
pwIdentifier identifier from the original transaction.
YocoStaff* staffMember = [[YocoStaff alloc] initWithNumber:@"1234" andName:@"Andrew"];[YocoClient refund:pwIdentifier withStaff:staffMember];