Token Refund {#pax-aio-payment-txn-token-refund-task}
=====================================================

To process a credit through a token, you must have the `Token Management Service` product enabled and an existing (saved) token from a tokenized transaction. For more information, see [Token Management Service](https://developer.cybersource.com/docs/cybs/en-us/tms/developer/ctv/rest/tms/tms-overview.md ""). Use this information to process a token refund. This transaction enables you to process a stand-alone credit for a tokenized card.  
Follow these steps to process a token refund.

1. Create a `TransactionParameters` object and provide the required information for the payment.

2. Create an `accountParameters` object and set the `instrumentIdentifierID` from the original transaction's metadata as the `shopperAccountIdentifier`.

3. Retrieve the `transactionIntent` variable from the `mposUi` object and use the `startActivity` method to initiate the transaction flow.

   ```
   val transactionParameters = TransactionParameters.Builder()
               .refund(BigDecimal("1.00"), Currency.EUR)    
               .customIdentifier("yourReferenceForTheTransaction")
               .build()

   val accountParameters = AccountParameters.Builder().token().cybersource().shopperAccountIdentifier("instrumentIdentifierID").build();

   val transactionIntent = mposUi.createTransactionIntent(transactionParameters, null, accountParameters)
   startActivityForResult(transactionIntent, MposUi.REQUEST_CODE_PAYMENT)
   ```
4. After the transaction is complete and the Summary screen is dismissed, the `onActivityResult` method is triggered. This action returns information about the last transaction.

   ```
   Override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) 
   {
       super.onActivityResult(requestCode, resultCode, data)
    
       if (requestCode == MposUi.REQUEST_CODE_PAYMENT) {
           when (resultCode) {
               // Result code from a successful transaction
               MposUi.RESULT_CODE_APPROVED -> {
                  val transactionIdentifier = data?.getStringExtra(MposUi.RESULT_EXTRA_TRANSACTION_IDENTIFIER)
                  Toast.makeText(findViewById(android.R.id.content),"Transaction approved!\nIdentifier: $transactionIdentifier", Toast.LENGTH_LONG).show()
               }
               // Result code from a declined, aborted or failed transaction
               MposUi.RESULT_CODE_FAILED -> {
                  Toast.makeText(findViewById(android.R.id.content), "Transaction was declined, aborted, or failed", Toast.LENGTH_LONG).show()
               }
           }
       }
   }
   ```
5. Get the full transaction object by retrieving the `latestTransaction` property from the mposUi object.

   ```
   val transactionObject = mposUi.latestTransaction
   ```