> 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/transit.md).

# Transit

### Overview

A `transit transaction` is a contactless transaction performed at a transit terminal, such as a subway gate reader.

According to Mastercard and Visa implementation guides for transit, a transit transaction is typically treated as a `zero-amount ODA transaction` (offline transaction).

In high-traffic environments, speed is critical. To improve the user experience, a transit transaction can be completed without end user authentication. This is how the `transit experience` works in NFC Payment.

{% hint style="warning" %}
For a **Mastercard** digital card profile, the CVM model must be **Flexible CDCVM** and must support payments without authentication for transit use cases.
{% endhint %}

### User experience

The end user taps the transit reader to access the transit system. The transaction uses the default digital card. No end user authentication is required.

### Flow

<figure><img src="/files/UZuJphQx7T7JeWXUB6EQ" alt=""><figcaption><p>Transit payment experience.</p></figcaption></figure>

### SDK

Configure the transit experience during D1 SDK initialization, as shown in the code snippet below.

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

```java
// NFC Payment configuration: transit transaction
D1PayConfigParams configParams = D1PayConfigParams.getInstance();
// Set to true to allow a transit transaction without CDCVM.
configParams.setTransitExperienceAllowed(true);
```

{% endtab %}
{% endtabs %}


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