I heard about Message Bank when we started redesigning a Health Connect production to run in containers in the cloud. Since there will be multiple IRIS containers, we were directed to utilize Message Bank as one place to view messages and logs from all containers.
How does Message Bank work?
I added Message Bank operation to our Interoperability Production. It automatically sends messages and event logs to the Message Bank.
Resending Messages
The Message Bank provides an interface for portal user to resend messages from the Message Bank portal.

