# Mobile overview

This document provides an overview of the Kustom Checkout Mobile SDK. It allows merchants to integrate Kustom's products into their iOS and Android applications, providing a seamless mobile purchase experience.

## What is it?

The Mobile SDK enables native integration of Kustom and KustomCheckoutSDK products into apps, allowing customers to pay with Kustom.

There are two integration methods:

### Native approach

For fully native apps, integration is achieved in three steps:

1. Fetch a Kustom Checkout HTML snippet from your web server.
2. Set the snippet and display the Kustom Checkout view.
3. Establish a callback to handle SDK events.


Detailed guides are available for:

* iOS / Native: [iOS integration](/contents/checkout/integrate-kco-in-your-mobile/ios-integration)
* Android / Native: [Android integration](/contents/checkout/integrate-kco-in-your-mobile/android-integration)
* React Native: [React Native integration](/contents/checkout/integrate-kco-in-your-mobile/react-native-integration)


### Hybrid approach

For apps rendering Kustom content in a web view, the SDK integrates with your web view and reacts to navigation events:

1. Initialize the SDK with your web view.
2. Present your web page.
3. Notify the SDK about web view events.
4. Establish a callback to handle SDK events.


Important information
## Migrate to KustomMobileSDK

KustomMobileSDK is built on top of KlarnaMobileSDK and offers feature parity for Kustom Checkout.

KustomMobileSDK was migrated from the following KlarnaMobileSDK versions:

Android: 2.6.29

iOS: 2.7.0

React Native: 2.4.10

We recommend migrating directly to KustomMobileSDK, even if you are several minor versions behind.

1. Download the KustomMobileSDK
2. After updating the SDK, rename the instance from `KlarnaCheckoutView` to `KustomCheckoutView`