Customizing or injecting new notifications from outside Fusion is not straightforward.

Creating completely custom bell notifications typically requires development using Oracle Fusion Application Composer or using Notification Message Framework APIs if available.

OIC can integrate with Fusion apps using REST APIs or SOAP services.

However, there is no direct public API to send custom bell notifications into Fusion’s notification bell system.

You can trigger business processes or workflows inside Fusion via OIC that, as a side effect, generate notifications.