The sandbox is a place where you can access the api resources without making real time changes to production data. When accessing Paychex’s sandbox, the end points will be the url you are accessing with “sandbox” in the beginning of the url. (e.g., https://sandbox.api.paychex.com). You can authorize using your applications same API Key and Secret that is used in production. For your convenience, sample data will be used and returned. You can perform insert, delete, and updating tasks, but the changes will not be saved in the sandbox (reverted). Normal responses will be provided (e.g., status, error, objects, etc.).