# ONE store IAP API V7 (SDK V21) Guide

## ONE store IAP V21 - Notice <a href="#onestoreiapapiv7-sdkv21-guide-onestoreiapv21-notice" id="onestoreiapapiv7-sdkv21-guide-onestoreiapv21-notice"></a>

ONE store's latest In-App Purchase (IAP) API V7 (SDK V21) has been released.\
Use the latest, most powerful version to access a variety of functions.

This page is a guide for IAP API V7 (SDK V21) on how developers using API V5 or API V6 can migrate to API V7.\
It is not compatible with API V4 (SDK V16) and earlier versions. For instructions on downloading IAP API V4 (SDK V16), please click [here](https://onestore-dev.gitbook.io/dev/eng/tools/billing/old-version/v16).

{% hint style="info" %}
For guidance on the global distribution of in-app purchase enabled apps, please refer to the guide below.

* [Preparation for Distribution on ONE store Global](https://onestore-dev.gitbook.io/dev/v/eng/tools/tools/glb)
  {% endhint %}

* [ONE store In-App Purchase (IAP) V21](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/ov)

* [Pre-Preparations for ONE store IAP](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/pre)

* [Test Purchases and Security.](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/test)

* [Implementing ONE store IAP SDK](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/sdk)

* [\[EN\] ONE store IAP References](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/references)

* [ONE store IAP Server API (API V7)](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/serverapi)

* [Using PNS (Push Notification Service)](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/pns)

* [Subscriptions](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/subs)

* [ONE store IAP Release Notes.](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/releasenote)

* [Sample Download](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/sample)

* [Upgrading ONE store IAP to V21](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/upgrade)

* [Using ONE store IAP (SDK V21) from Unity](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/unity)

* [Upgrading to IAP SDK V21 from Unity](https://onestore-dev.gitbook.io/dev/eng/tools/billing/v21/unitymig)