Can you access REST API without installing a SmartApp?

[Automated_House (Jimmy)]

you should be able to using the new developer environment

Build a Connected Future with SmartThings | SmartThings Developers

Example WebHook SmartApp Source Code - New APIs!

Fellow developers - One of the booths at the 2017 SDC (Samsung Developer Conference) allowed developers to come and build their own SmartApp, using the new APIs. This example is now open-sourced, and provides a good (yet relatively simple) example of the new SmartApp model. You can find the example source code here. We’ll be adding more open-source examples in the future, and if you haven’t yet, check out the example that shows using the REST API and personal access tokens to get information about and control devices!