Mindtalk application is an instance used as credential to accessing our API.
Before you can play with Mindtalk resources through API, you need a Mindtalk application, you can create your first application by following procedures from Getting started
After you have at least one application then you can playing around, see the Examples for the basic usage.
If you need a special access like XAuth and other internals API then you need to verify your application, see Verify application