要获取阿里巴巴店铺的所有商品信息，可以通过调用阿里巴巴开放平台提供的API接口来实现。以下是调用API接口的一般步骤：

 注册开发者账号：首先需要在开放平台注册成为开发者，并创建应用以获取API密钥（App Key和App Secret）。

 阅读API文档：在开放平台中找到商品API的详细文档，了解如何构建请求、需要哪些参数、请求的格式以及可能的响应。

 编写代码调用API：使用编程语言（如Python）和HTTP请求库（如requests库）来构建和发送API请求。

以下是一个简化的Python代码示例，用于调用获取店铺商品列表的API：

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 处理响应：API会返回包含商品信息的数据，通常是JSON或XML格式。解析这些数据以提取所需的商品信息。

 错误处理：妥善处理可能出现的错误，如网络问题、错误的请求参数或服务器