Question - Mirroring Custom API workflows on multiple accounts

Can anyone share any ideas of how to do the following: My app allows people to subscribe to let’s call “MasterAccounts” These master accounts make specific API calls and I’m trying to integrate a workflow that when the master account initiates such action, that action triggers an API workflow on all their subscribers accounts while passing data to inject into the subscribers API workflow while doing arithmetic on a specific field for each subscribers API action triggered by the master account. Any suggestions?