> ## Documentation Index
> Fetch the complete documentation index at: https://docs.appcharge.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

The Payment Links SDK allows you to integrate a mobile checkout experience directly into your app. Instead of using traditional in-app purchases, players are sent to a fast, mobile-optimized checkout page via a payment link, where they can purchase items like coin packs, character skins, or bundles. For a step-by-step guide to integrating this flow, see the [SDK Payment Link Flow](./payment-link-flow).

## Before you begin

Before integrating the SDK, make sure you've:

1. Developed and exposed an API endpoint to receive player transaction updates from Appcharge, following the [Grant Award Callback](/../../api-reference/checkout/awards/grant-award-callback) schema.
2. Entered your API endpoint URL in the Publisher Dashboard under **Settings -> Integration**.

## Supported engines and platforms

The Payment Links SDK supports the following engines and platforms:

* [Unity](./unity/setup)
* [Native iOS](./ios/setup)
* [Native Android](./android/setup)

If your app uses another engine or platform, contact your account manager to scope a custom bridging plan before integrating the SDK.

## Integrate the SDK

To integrate the SDK:

1. Follow the setup instructions for your platform to import and configure the Payment Links SDK.
2. Initialize the SDK.
3. Implement the SDK callback methods.
4. Retrieve price points. Not relevant for Unity WebGL.
5. Launch the checkout.