I really like this question @rrarkala because I am constantly integrating Anaplan to something, even applications that don't have a native connector.
Now, as you know, Anaplan doesn't have a connector for MPA but what I've learned is to rely on the Anaplan API set, usually V1.3 with a CA certificate to "automate" the workflow.
You need a good scheduler though, I will admit.
Typically, I will create a workflow dashboard in Anaplan that monitors the Booleans as each task gets completed. This means a lot of imports and exports and module to module imports.
Every now and then, my workflow will get messed up because I lose an internet connection or something. In that case I also have a timer set to check on the workflow status. If it gets hung up, I have an email sent.
If you have a specific use-case for MPA I'd love to hear it. Maybe we can put our heads together and build something out.
Also, check out @MagaliP new webpage for all things "add-ins". There might be some clever use cases there for you. To be honest, most of my development starts with these add-ins.