You can configure all notifications and indicate which ones need to be sent in the Types of notifications tab in the Settings — System settings — Notifications section.
Here you’ll also be able to set the order for notification channels. Client will receive a PUSH notification if they have your mobile app for clients installed.
Rules for sending PUSH and SMS
1. PUSH notification will be sent in your mobile app for clients.
2. If the notification isn’t delivered then the SMS notification will be sent according to the corresponding template.