我正在使用 javascript 和谷歌应用引擎将谷歌钱包用于数字商品。当我的应用程序调用 buy() 函数时，我会在演示中看到预期的屏幕，但随后超时并给出错误消息。消息是Uh oh. There was a problem. We couldn't start your purchase because of a technical issue. Details of the problem below: There is an error in the setup for your purchase. Please contact the merchant about this issue.
谁能给我一个关于问题出在哪里的线索？
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