No questions are stupid. Well… some questions might be, but, regardlesss…
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Is that url tied to that SmartApp? YES
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In other words if I were to delete that app would the endpoint url still work? NO
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Would I create an app specifically to get the endpoint urls? YES
There was a time that all your Devices would have a default Endpoint with no SmartApp required, but I think that feature no longer exists (for enhanced security reasons). No big deal. Search for ThingLayer (linked below) for a SmartApp that seems to create endpoints for nearly everything! -
I know nothing about OAuth (the first time I heard of it was through ST) but am learning.
Same here… Luckily the Documentation is updated on this and there are some good examples (but, NB: the process has changed recently to meet enhanced specifications, so be sure to reference “current” examples).