Unfortunately, any third party service that integrates with SmartThings will be limited to interacting with a single location based on the current state of the OAuth implementation without some clunky workarounds. A third-party software company can perform multiple authorizations to the SmartThings platform, but they would have to manage all of the logic and taxonomy within their application. I don’t know of any apps that make calls to multiple SmartApp instances from a single third-party app instance.
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