How To Trigger Custom Notification Using Apex In Salesforce?

Account accObj = new Account();

accObj.Name ='SFDC SAGA';

Insert accObj;

CustomNotificationType notificationType = [SELECT Id FROM CustomNotificationType WHERE DeveloperName = 'Notification'];

Messaging.CustomNotification notification = new Messaging.CustomNotification();

notification.setTitle('New Account Created - ' + accObj.Name );

notification.setNotificationTypeId( notificationType.Id );

notification.setBody('click here to navigate to the account record.');

notification.setTargetId(accObj.Id);

try{

    notification.send(new Set<String> { accObj.OwnerId });

}

catch (Exception e) {

System.debug('Problem sending notification: ' + e.getMessage());

}