> For the complete documentation index, see [llms.txt](https://onestore-dev.gitbook.io/dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onestore-dev.gitbook.io/dev/chi/tools/billing/v21/pre.md).
# 为应用One Store In-App支付做事前准备
## **商品注册**
有关商品注册的详细信息，请参考以下指南。
* [App Registration and Mgmt.](/dev/chi/docs/apps.md)
## **确认许可证密钥（Public Key）及OAuth认证信息**
在“公共信息 > 许可证管理”菜单中，可以查看用于服务器API的许可证密钥和OAuth认证信息。
* 许可证密钥：用于确认One Store传递的In-App支付订单是否存在伪造和篡改。
* OAuth认证信息：为了使用One Store 服务器API而进行的认证。
## **下载Sample软件**
可以在Github下载In-App支付的Sample软件。
* [下载One store In-App支付API V7(SDK V21)Sample软件](/dev/chi/tools/billing/v21/sample.md)
## **添加In-App支付library**
{% hint style="warning" %}
ONE Store IAP SDK 存储库将于 **2026 年 4 月 1 日** 起迁移至 **Maven Central**。
详细信息请参考 [Notice on Migration of ONE store IAP SDK Repository](https://dev.onestore.net/devpoc/support/news/noticeView.omp?noticeId=33714)
{% endhint %}
在项目的顶层 `build.gradle` 文件中添加 ONE store 计费库依赖项。
```gradle
allprojects {
repositories {
...
mavenCentral()
}
}
```
以下是在应用软件的`build.gradle` 文件中添加ONE store支付library从属项目。
```gradle
dependencies {
implementation "com.onestorecorp.sdk:sdk-iap:21.04.00"
}
```
## **安装One store应用软件**
开发者或用户需要安装 ONE Store 应用才能使用应用内购买功能。
* [**ONE Store 应用下载指南**](/dev/chi/policy/download.md)
---
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