Contains information returned by an API component.
The name of the component that was executed (ie 'Medal.unlock').
An object, or array of one-or-more objects (follows the structure of the corresponding 'call' property), containing any returned properties or errors.
If you passed an 'echo' value in your call object, it will be echoed here.
The 'data' object will always contain a 'success' property. If the call was unsuccessful, there will also be an 'error' property.