> For the complete documentation index, see [llms.txt](https://docs.namiml.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.namiml.com/sdk-reference/namicustomermanager/login.md).

# login

Provide a unique identifier that can be used to link different devices to the same customer in the Nami platform. This customer id will also be returned in any data sent from the Nami servers to your systems as well.

The ID sent to Nami must be a valid UUID or you may hash any other identifier with SHA256 and provide it in this call.

{% hint style="danger" %}
**Nami Will Not Accept PII as an Identifier**

Email addresses and usernames cannot be sent to Nami via this call. Nami only accepts data that is a valid numeric, UUID or a SHA256. Any other data will be rejected by the Nami server.
{% endhint %}

{% tabs %}
{% tab title="Swift" %}

```swift
NamiCustomerManager.login(withId: "123456")
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
NamiCustomerManager.login("123456")
```

{% endtab %}

{% tab title="Flutter" %}

```dart
NamiCustomerManager.login(withId: "123456");
```

{% endtab %}

{% tab title="React Native" %}

```jsx
const onLoginPress = useCallback(() => {
  NamiCustomerManager.login(
    '123456',
    (success, error) => {
      console.log('success', success);
      console.log('error', error);
    },
  );
}, []);
```

{% endtab %}

{% tab %}

```c
NamiCustomerManager.Login("123456");
```

{% endtab %}
{% endtabs %}


---

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