每个GET调用返回一个json格式的字符串，这是查询的交易的状态数据，见清单5。

Each GET invocation returns a JSON-formatted data representation of the status of the transaction being queried, as shown in Listing 5.

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它解析状态查询请求，验证用户凭证，调用Payflow网关服务，然后以JSON对象的形式返回交易的状态。

It parses the incoming status lookup request, authenticates the user credentials, calls the Payflow gateway service, and then returns the status of the transaction formatted as a JSON object.

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