Instrument applications without access to source code - e.g. Postman

[Mattias.Wessman]

Our developers have the need to - during development - test and analyze API requests through Postman hitting a third-party vendors API not being instrumented by AppDynamics, furthermore ending up in mainframe, which is instrumented by us.

How would I go about accomplishing this? Installing an agent on dev-machine, but how do I hook into Postman?