This allows developers to easily interchange services as needed without writing tedious code for the sole purpose of making them work together.
这样就允许开发者在需要时很容易地互换服务，不需要再编写那些唯一的目的就是使这些服务能协同工作的累赘的代码。
Refer to the project interchange file in the Download section to see the code for the other checkout method.
参考下载部分中的项目交换文件，查看另一个checkout方法的代码。
You can download a Project Interchange file containing all the code for this example. If you want to work through this article, then import these projects
您可以下载一个包含本例中所有代码的项目互换文件。
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