How to tell which 3rd party apps are using your API key?

I was instructed to generate a new API key by Infusionsoft support. as a potential fix to an issue with one integration However, I realize that in doing this, it will disconnect all of the other 3rd party apps currently connected to our site.

I was not around when these were set up, so I don’t know which programs/services will need to be updated. Is there any way to find out in advance which programs are using the API key, so that I can change them all when I generate the new one? Or, alternatively, do I just have to wait and see what breaks in order to know it needs a new API key.

There isn’t and that is one of the reasons the legacy API key has been deprecated in favor of OAuth 2.0