Amazon IAP窗口.AmazonIapV2未定义

Question

我正在FireTv设备上测试html5 Web应用程序，这里包括了示例中的两个必要脚本：https://developer.amazon.com/docs/in-app-purchasing/iap-example-webapp.html

包含的脚本：

https://resources.amazonwebapps.com/v1/latest/Amazon-Web-App-API-tester.min.js

https://resources.amazonwebapps.com/v1/latest/Amazon-Web-App-API.min.js

但是，全局窗口。AmazonIapV2的评估结果为undefined，并且window.AmazonIapV2.addListener的错误信息消失了。

---

if (window.AmazonIapV2 === null) { 

}  
else {    
   window.AmazonIapV2.addListener('getUserDataResponse', function(resp) {});    
   window.AmazonIapV2.addListener('getProductDataResponse', function(data) {});    
   window.AmazonIapV2.addListener('purchaseResponse', this.onPurchaseResponse);    
   window.AmazonIapV2.addListener('getPurchaseUpdatesResponse',this.onPurchaseUpdatesResponse);  
}