baseURL : The URL of the Marqeta developer sandbox, without the trailing slash.First, let's create an environment called "Marqeta developer sandbox" and add three variables: For this post, we'll have an environment for the sandbox and an environment for the mock server. In Postman, we can save variables and settings for different environments, and then choose an environment to use when sending requests. With Postman installed, we will create a new environment. Set up a developer account with Marqeta to get access to the developer sandbox.To get started, you will first need to take the following steps: With the fundamentals out of the way, let's dive in. This will avoid a false negative when using a mock server.) (Of course, if you're testing how your application specifically handles duplicate token responses, then you would need to write a proper test for that, too. You could never rerun a test suite with that data.īy using a mock server, however, you can send that request repeatedly, without encountering the duplicate token issue. After that, the johndoe user token would be taken. If you did this in the developer sandbox, then you would only be able to send that "create user" request one time. For example, let's say you want to test the creation of a user with the user token johndoe. In this case, you can take advantage of a mock server.Īnother reason you might want to use a mock server is when you don't want to pollute the data in your developer sandbox with test data. Sometimes, your application testing simply needs to ensure requests are crafted properly or that responses are handled properly, and you're not as concerned about the actual data in those tests. For this, you would use a mock server.Ī mock server is a server that responds to your API requests in a sufficiently realistic way. While you can perform all of your Core API requests directly on your developer sandbox, there may be times when you want to test how your application sends requests and handles responses-without actually hitting the sandbox. Sending requests through Postman is another option. As you develop an application that uses the Marqeta platform, you might try out requests in the Core API Explorer, or you might use `curl` to send requests from the command line. Developers of applications that consume APIs also use Postman to test the sending of requests. API builders use Postman for design, documentation, and testing. Postman is an excellent tool for API development. 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. In this post, we'll work through how to use Postman to build a mock server that mimics the Marqeta Core API. 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.įor faster prototype development, however, you might find it useful to build an API mock server. The Marqeta Core API lets you build web applications for custom payment card programs with the Marqeta platform.
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