> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/nfc-payment/implement-nfc-payment/make-payment/payment-experience/manual-mode.md).

# Manual mode

### Overview

This section describes the **Manual mode** contactless payment flow. In this flow, the issuer application initiates the payment.

### User experience

The end user can initiate a contactless payment from the issuer application by using NFC Payment.

* **Manual mode:** The end user opens the issuer application, authenticates, and then taps the POS terminal.

<figure><img src="/files/uGOVnAUio69lKmZ0L8Wh" alt=""><figcaption></figcaption></figure>

### Flow

The issuer application calls `D1PayConfigParams.getInstance().setManualModeContactlessTransactionListener()` to set the `ContactlessTransactionListener` callback. Then, the issuer application calls `D1PayWallet.startManualModePayment()` to start the manual mode payment.

For implementation details, see [CDCVM Always](/nfc-payment/implement-nfc-payment/make-payment/payment-experience/cdcvm-always.md) and extend the abstract `ContactlessTransactionListener`.

When a manual mode payment starts, the following callback is called first:

* `ContactlessTransactionListener::onAuthenticationRequired()`

When the end user taps the POS terminal, the following callbacks are called in sequence:

* `ContactlessTransactionListener::onReadyToTap()`
* `ContactlessTransactionListener::onTransactionCompleted()`
  * `TransactionData` is only available on this callback for manual mode.

As shown in the sequence diagram below:

<figure><img src="/files/vSSjOlpH2ORiAyUyC3dk" alt=""><figcaption></figcaption></figure>

### SDK

{% tabs %}
{% tab title="Android Java" %}

```java
// extend ContactlessTransactionListener
ContactlessTransactionListener paymentCallback;
// register manual mode contactless transaction callback
D1PayConfigParams configParams = D1PayConfigParams.getInstance();
configParams.setManualModeContactlessTransactionListener(paymentCallback);

// start manual mode payment
String cardId = ""; // selected card ID
D1PayWallet d1PayWallet = d1Task.getD1PayWallet();
d1PayWallet.startManualModePayment(cardId);
```

{% endtab %}
{% endtabs %}


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