To get access to the sandbox environment please reach out to your Super Account Manager
A sandbox is an isolated test environment. You can use your sandbox to test Super functionality in your account, and experiment with new features without affecting your live integration. For example, when testing in a sandbox, the payments you create aren’t processed by card networks or payment providers.
API
The api for your sandbox is api.test.superpayments.com
Authentication
Your API key for the test environment will start with sk_test_
Javascript resources
Use https://cdn.superpayments.com/js/test instead of https://cdn.superpayments.com/js
Testing
Go to the test section in the documentation for more.