Today I accidentally uninstalled Payables Agent. I say accidentally but really it was on purpose with the intention of reinstalling it so that maybe I could fix a broken functionality. I learned the sales order agent is available via App Source but not Payables Agent.
If you run this (switch [ENT]) to your enterprise, you'll be able to install it again.
https://businesscentral.dynamics.com/[ENT]/?noSignUpCheck=1&filter=%27ID%27%20IS%20%2714aa1237-2f69-4c25-9a68-fa7d54e08613%27&page=2503
Hope this helps someone else.
