What is "Sandbox" app and how does it work?

Once you create an app on our platform, it is initially in the sandbox environment. An app stays in a sandbox environment unless you register your WhatsApp Business API number using the traditional Go-Live or Facebook's embed process.

An app of sandbox environment allows you to test WhatsApp Business APIs, Gupshup features, and other end-user behaviors before you determine to Go-Live. 

Please note that a sandbox Access API app is limited and only supports sending media messages given here.