Managing/deleting users/avatars created via api

Is there a way to list all the users/avatars that I created via the API?

Is there a way to delete all the users/avatars that I created via the API? (even if it’s via support)

I’m asking this because I did several tests and experiments during the integration and now I’m preparing to put my application into production and I think it’s interesting to clean up those users/avatars that were only used for testing.