The image shows Oracle Cloud containing two customer OCI retail tenancies.

• Tenancy one contains RDS, API service, and Merchandising CS.
• Tenancy two contains Integration CS and OCI Functions as part of Enterprise Integration Strategy, as well as Object Storage and real-time-streaming.

An on-premises, cloud, or third-party area contains customer apps with third-party or legacy systems. These send data to Object Storage on-demand and receive data in real time from the real-time streaming.

The API service can pull from or push to the Enterprise Integration Strategy; options one and two in the reference architecture respectively. Integration CS and OCI Functions then send data to Object Storage and the real-time streaming.