> ## Documentation Index
> Fetch the complete documentation index at: https://developer.nomba.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Trigger bank transfer payments

> Learn how to receive bank transfer payments from your customers

<Note>
  The aim of this document is to assist you in initiating bank transfer payment from your custom application running on the Nomba Android terminal. If you encounter any difficulties with this process, feel free to [reach out for support.](/support/reach-out)
</Note>

<Tip>
  Trigger bank transfer payments - available since NombaX Application `v1.6.2`
</Tip>

This following code snippet serves as a foundation for triggering bank transfer payment events on the Nomba terminal. Adjustments to the amount, transaction reference, and other parameters can be easily made based on specific application requirements.

<CodeGroup>
  ```kotlin trigger_bank transfer_payment.kt theme={null}
  const val PAY_BY_TRANSFER_INTENT = "com.nomba.pro.feature.pay_by_transfer.ACTION_VIEW"
  const val AMOUNT_DATA = "amount"
  const val TXN_RESULT = "txnResultData"
  const val RECEIPT_OPTIONS = "receiptOptions"

  val resultString = mutableStateOf("")

  //setup a launcher that would help launch the intent
  var payByTransferLauncher =
  registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
      val data: Intent? = result.data
      if (result.resultCode == Activity.RESULT_OK) {
          resultString.value = data?.getStringExtra(TXN_RESULT) ?: "null"
      }
  }

  //setup an intent to be triggered
  val intent = Intent(PAY_BY_TRANSFER_INTENT)

  //put the amount to be charged
  intent.putExtra(AMOUNT_DATA, "300")

  //handle receipt medium
  val receiptOptionsMap = hashMapOf(
      "print" to true,
      "sms" to false,
      "email" to false
  )
  val receiptOptionsString = Json.encodeToString(serializer<HashMap<String, Boolean>>(), receiptOptionsMap)
  intent.putExtra(RECEIPT_OPTIONS, receiptOptionsString)

  //launch the intent
  payByTransferLauncher.launch(intent)
  ```

  ```java trigger_bank_transfer_payment.java theme={null}
  public static final String PAY_BY_TRANSFER_INTENT = "com.nomba.pro.feature.pay_by_transfer.ACTION_VIEW";
  public static final String AMOUNT_DATA = "amount";
  public static final String TXN_RESULT = "txnResultData";
  public static final String RECEIPT_OPTIONS = "receiptOptions";

  // Assuming you have a mutable state variable similar to mutableStateOf in Java
  private MutableLiveData<String> resultString = new MutableLiveData<>();

  // Setup a launcher that would help launch the intent
  ActivityResultLauncher<Intent> payByTransferLauncher = registerForActivityResult(
          new ActivityResultContracts.StartActivityForResult(),
          result -> {
              Intent data = result.getData();
              if (result.getResultCode() == Activity.RESULT_OK) {
                  resultString.setValue(data.getStringExtra(TXN_RESULT));
              }
          }
  );

  // Setup an intent to be triggered
  Intent intent = new Intent(PAY_BY_TRANSFER_INTENT);

  // Put the amount to be charged
  intent.putExtra(AMOUNT_DATA, "300");

  //handle receipt medium
  HashMap<String, Boolean> receiptOptionsMap = new HashMap<>();
  receiptOptionsMap.put("print", true);
  receiptOptionsMap.put("sms", false);
  receiptOptionsMap.put("email", false);

  String receiptOptionsString = Json.encodeToString(serializer(HashMap.class, Boolean.class), receiptOptionsMap);
  intent.putExtra(RECEIPT_OPTIONS, receiptOptionsString);

  // Launch the intent
  payByTransferLauncher.launch(intent);
  ```
</CodeGroup>

<Tip>
  Please note that the following details will make reference to the kotlin code snippet
</Tip>

#### Constants

|                          | Description                                                                              |
| ------------------------ | ---------------------------------------------------------------------------------------- |
| `PAY_BY_TRANSFER_INTENT` | Defines the action string for the intent, indicating the type of action to be performed. |
| `AMOUNT_DATA`            | Represents the key for passing the amount to be charged during the payment process.      |
| `TXN_RESULT`             | Represents the key for extracting transaction result data from the intent.               |

#### State Variable

|                | Description                                                                                                                                   |
| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| `resultString` | A mutable state variable initialized as an empty string, which is intended to store the transaction result received from the launched intent. |

#### Intent Setup

|                                               | Description                                                                       |
| --------------------------------------------- | --------------------------------------------------------------------------------- |
| `val intent = Intent(PAY_BY_TRANSFER_INTENT)` | Creates an instance of Intent with the specified action `PAY_BY_TRANSFER_INTENT`. |
| `intent.putExtra(AMOUNT_DATA, "300")`         | Adds extra data to the intent, including the amount to be charged `AMOUNT_DATA`.  |

#### Launching the intent

|                                        | Description                                                                                     |
| -------------------------------------- | ----------------------------------------------------------------------------------------------- |
| `payByTransferLauncher.launch(intent)` | Initiates the intent, triggering the Android system to display the payment options to the user. |

#### Result Handling

Inside the result callback, the code retrieves the transaction result from the received intent and updates the `resultString` variable.