To log in to RingCentral, get the Platform object and call its authorize method, providing valid username, extension, and password values. Enter your phone number in E.164 format for username. The + may be omitted.
A Promise is returned, and you can use its then method to specify your continuation function, and its catch method to specify an error handling function.
var platform = rcsdk.getPlatform();
platform.authorize({ username: '+18001234567', // your phone number in E.164 format extension: '101', // leave blank if direct number is used password: 'yourpassword' }).then(function(ajax) { // your code here }).catch(function(e) { alert(e.message || 'Server cannot authorize user'); });