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Sandbox is an environment where you can mimic the characteristics of the production environment and create simulated responses from all APIs the application relies on before going live. You can make API tests based on your own requirements including making a transaction, cancel, or refund a transaction, and so on.

See Sandbox for details.

Sandbox是一个测试环境，你可以在其中模拟生产环境的特征，并在应用程序上线之前依赖于所有API创建模拟响应。 你可以根据自己的要求进行API测试，包括进行交易，退款等操作。

可以参考https://global.alipay.com/doc/common/sandbox这个链接了解详细内容。