# registerBuySkuHandler

{% hint style="info" %}
**For Paywalls-only plans**

This method is for customers who have implemented their own in-app purchases or subscription code directly with the App Store, Google Play, etc. or who are using another third-party for subscription or purchase management.

Your Nami account needs to be on a Paywalls-only plan to use this interface. Contact <support@nami.ml> for details.
{% endhint %}

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

```swift
NamiPaywallManager.registerBuySkuHandler { sku in
    print("Start the purchase flow for App Store product: \(sku.storeId)")
}
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
NamiPaywallManager.registerBuySkuHandler { paywall, sku ->
    Log.d(LOG_TAG, "Start the purchase flow for Google Play/Amazon Appstore product: $skuRefId")
}
```

{% endtab %}

{% tab title="Flutter" %}

```
// Coming soon
```

{% endtab %}

{% tab title="React Native" %}

```jsx
NamiPaywallManager.registerBuySkuHandler((sku) => {
    // Start your purchase flow   
    console.log(
      'buy sku handler - start purchase flow for sku:',
      sku.skuId,
    );
}
```

{% endtab %}

{% tab title="Unity" %}

```c
NamiPaywallManager.RegisterBuySkuHandler(buySkuCallback);
```

{% endtab %}
{% endtabs %}

Registering with `NamiPaywallManager.registerBuySkuHandler` will provide a callback from a Nami paywall when the user has selected a sku and asked for the purchase flow to start.

It is you're responsible to listen to this handler's callback to start the purchase with the provided sku.

Once the purchase is successful, indicate it is complete by calling [buySkuComplete](/sdk-reference/namipaywallmanager/buyskucomplete.md) to close the paywall.


---

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