Test your Application
Square provides developers with a test environment and tools that you can use to learn how to make the correct REST API calls to integrate your application with Square.
Square Sandbox. To learn about the fully segregated Sandbox API test environment, see Test in the Sandbox.
Square API Explorer. To learn about the Square-hosted API exploration tool that you can use to mock up Square API calls in an interactive experience, see Test Square APIs with API Explorer.
Postman. If you are familiar with Postman and want to see how it is used with Square APIs, see Test Square APIs with Postman.
Command-line tools. You can call Square APIs from a client command line while in development. To learn more, see Test Square APIs with Command-Line Tools.