To send mobile notifications, Salesforce offers several options: Apex, REST API, and, in some cases, declarative feature-based tools. The type of notification, the delivery channel, and your skill comfort levels guide your choice.
Send Apex push notifications with the Messaging.PushNotification methods in Apex triggers, or through the PushNotifications API.
You can send custom notifications through the customNotificationAction API, Process Builder, or Flow.
Send Custom Notifications with Notification Builder Platform
Using Apex Triggers to Send Push Notifications
An Apex trigger creates new notifications and sends them to a specified external client app.
Send custom notifications to recipients via desktop or mobile channels.
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