I have an existing site that is using the old api url and api key. I am in the process of converting to using the new api. Im afraid to click the button to obtain a new api key because I don't know if the old one will still work. We currently use the old api in production to sync our users email notification settings so I can't risk breaking that. In development I need the new api stuff. Can you run the old api along side the new api and take advantage of the new features from the same account?
Yup, you can generate the new API key and not worry about anything breaking ;-) Both API's can be running along side each other, there'll just be some features that obviously aren't available in the legacy API.