This method returns a promise object, which can be in one of the following states:
Resolve - confirms that the user is logged into the Pega Platform.
Reject - returns an object that is an instance of a generic Error
class, as described below.
{
"name": error_code
"message": detailed_message
}
Where error_code stands for one of the error codes described in the
Constants section of the Authentication article and
detailed_message can be an additional message from the native
side.