How to Use Postman to Build a Mock Server That Mimics the Marqeta Core API?

The Marqeta Core API lets you build web applications for custom payment card programs with the Marqeta platform. While SDKs for the Core API are available for Python and Ruby, you can always use the developer sandbox and the Core API Explorer to work with the API, regardless of the language you use to develop your application.

For faster prototype development, however, you might find it useful to build an API mock server. In this post, we'll work through how to use Postman to build a mock server that mimics the Marqeta Core API. We'll demonstrate how to create a new collection in Postman, save responses from live requests to the sandbox, and then create a mock server and send our test requests.

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