What is Sandbox?
Before you start using our API we advise you to try it in our sandbox environment. Sandbox environment was created explicitly for testing purposes. All purchases processed through sandbox API are simulated.
To start testing API in sandbox, you will need to sign up for an account here (this account will not be associated with the one you have at http://www.namecheap.com/). Go to Manage Profile menu, select API Access option and enable access to sandbox API there. You will get API username and key almost immediately.
After you run some tests and find out that you are satisfied with the work of our API, please contact us and ask for assistance with enabling API in production environment for your NameCheap account.