What is Custom Notification?
Custom Notification is a customized notification where the admin can add recipients, subjects, and content.
Admin can be sent a custom notification when any important event occurs. custom notifications can be sent via a process in Process Builder, a Flow in Flow Builder, or an invocable action API
Available in: both Salesforce Classic and Lightning Experience
Available in: Essentials, Professional, Enterprise, Performance, Unlimited, and Developer Editions
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How to Create a Custom Notification?
You can create a custom notification via Setup -> Notification Builder. Click New to create a new notification

Provide “Custom Notification Name” and “API Name” will be auto-populated.
Check both “Supported Channels” & Save

So finally, we created a custom notification & now let’s use flow builder to the send Notification.
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Scenario:
Create a Flow to send a custom notification when an opportunity record stage is changed from Prospecting to Negotiation/Review with Amount 1000.
Learn more about Flow Core Action: Send Custom Notification





