Performing Refunds
The PayButton makes it easy to implement refunds.
Your transaction is based on a set of 
MPTransactionParameters
 and provided to 
[MposUi createTransactionViewControllerWithTransactionParameters:]
.
To perform a full or partial refund, you must create new 
MPTransactionParameters
 with the 
transactionIdentifier
 of the previous charge transaction. For partial refunds, you must specify the amount that should be refunded.
How to perform refunds:
- (IBAction)refund:(id)sender {
    MPUMposUi *ui = [MPUMposUi initializeWithProviderMode:/*...*/];

    ui.configuration.summaryFeatures =
    MPUMposUiConfigurationSummaryFeatureSendReceiptViaEmail;
    
    MPTransactionParameters *parameters =
    [MPTransactionParameters refundForTransactionIdentifier:@"<transactionIdentifier>"
                                                  optionals:
     ^(id<MPTransactionParametersRefundOptionals>  _Nonnull optionals)
     {
         optionals.subject = @"Refund for Bouquet of Flowers";
         optionals.customIdentifier = @"yourReferenceForTheTransaction";

         // For partial refunds, specify the amount to be refunded
         // and the currency from the original transaction
         // [optionals setAmount:[NSDecimalNumber decimalNumberWithString:@"1.00"] currency:MPCurrencyEUR];
     }];
    
    UIViewController *viewController =
    [ui createTransactionViewControllerWithTransactionParameters:parameters
                                                       completed:^(UIViewController *ui,
                                                                   MPUTransactionResult result,
                                                                   MPTransaction* transaction)
    {
        [self dismissViewControllerAnimated:YES completion:NULL];
    
        UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Result"
                                                        message:@""
                                                       delegate:nil
                                              cancelButtonTitle:nil
                                              otherButtonTitles:@"OK",nil];
        
        if (result == MPUTransactionResultApproved) {
            alert.title = @"Refund was made!";
        } else {
            alert.title = @"Refund was declined/aborted!";
        }
        
        [alert show];
        
    }];
    
    UINavigationController *modalNav = [[UINavigationController alloc] initWithRootViewController:viewController];
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        modalNav.modalPresentationStyle = UIModalPresentationFullScreen;
    } else { // Show as Form on iPad
        modalNav.modalPresentationStyle = UIModalPresentationFormSheet;
    }
    [self presentViewController:modalNav animated:YES completion:NULL];
}
As a result, you will receive one of the following:
  • The original transaction that now contains information about the refund in the 
    transaction.refundDetails
    .
  • An error indicating why refunding the charge failed.
To check if a transaction can be refunded in general, see 
transaction.refundDetails.status
.
Performing Refunds
The PayButton makes it easy to implement refunds.
Your transaction is based on a set of 
TransactionParameters
 and is used in conjunction with 
MposUi.createTransactionIntent()
.
To perform a full or partial refund, you must create new 
TransactionParameters
 with the 
transactionIdentifier
 of the previous charge transaction. For partial refunds, you need to specify the amount that should be refunded.
How to perform refunds:
TransactionParameters parameters = new TransactionParameters.Builder()
        .refund("<transactionIdentifer>")
        // For partial refunds, specify the amount to be refunded
        // and the currency from the original transaction
        //.amountAndCurrency(new BigDecimal("1.00"), io.mpos.transactions.Currency.EUR)
        .build();
Intent intent = ui.createTransactionIntent(transactionParameters);
startActivityForResult(intent, MposUi.REQUEST_CODE_PAYMENT);
As a result, you will receive one of the following via the 
onActivityResult()
:
  • The original transaction that now contains information about the refund in the 
    transaction.refundDetails
    .
  • An error indicating why refunding the charge failed.
To check if a transaction can be refunded in general, see
transaction.refundDetails.status
.

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