Configure Your Instance as a Private Endpoint
Configuring your instance to use a private endpoint inside your Virtual Cloud Network (VCN) in your tenancy instead of a public endpoint allows you to keep all traffic to and from your instance off of the public internet. Specifying the VCN configuration allows traffic only from the VCN you specify, and blocks access to the instance from all public IPs or VCNs.
This diagram shows an example of a network setup for a Visual Builder instance on Oracle Cloud Infrastructure when the instance has a private endpoint enabled.
If you wish, you can allow access to a private endpoint from outside the VCN by using a load balancer in front of the endpoint. This way you can allow public access to the instance, while the instance is within a private VCN where it can access your ATP database.