# 為套用ONE Store In-App支付做事前準備
## **商品註冊**
有關商品註冊的詳細資訊，請參考以下指南。
* [App Registration and Mgmt.](/dev/cht/docs/apps.md)
## **確認許可證密鑰（Public Key）及OAuth認證資訊**
在「公共資訊 > 許可證管理」菜單中，可以檢查用於伺服器API的許可證密鑰及OAuth認證資訊。
* 許可證密鑰：用於確認One Store傳遞的In-App支付訂單是否存在偽造和篡改。
* OAuth認證資訊：為了使用One Store 伺服器API而進行的認證。
## **下載Sample軟件**
可以在Github下載In-App支付的Sample軟件。
* [下載One store In-App支付API V7(SDK V21)Sample軟件](/dev/cht/tools/billing/v21/sample.md)
## **添加In-App支付library**
{% hint style="warning" %}
ONE Store IAP SDK 儲存庫將於 **2026 年 4 月 1 日** 起遷移至 **Maven Central**。
詳細內容請參考 [Notice on Migration of ONE store IAP SDK Repository](https://dev.onestore.net/devpoc/support/news/noticeView.omp?noticeId=33714)
{% endhint %}
在專案的最上層 `build.gradle` 檔案中新增 ONE store 付款（計費）程式庫的相依項目。
```gradle
dependencies {
implementation "com.onestorecorp.sdk:sdk-iap:21.04.00"
}
```
以下是在應用軟件的`build.gradle` 文件中添加ONE store支付library從屬項目。
```gradle
dependencies {
implementation "com.onestorecorp.sdk:sdk-iap:21.04.00"
}
```
## **安裝ONE store應用軟件**
開發者或使用者需要安裝 ONE Store 應用程式才能使用應用內購買功能。
* [**ONE Store 應用程式下載指南**](/dev/cht/policy/download.md)
---
# Agent Instructions: Querying This Documentation
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Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://onestore-dev.gitbook.io/dev/cht/tools/billing/v21/pre.md?ask=
```
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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.