At the moment it's only possible to create a external app which requires LTI settings.
We'd like to create a 'external app' that is just an external url. If we create a new external app with a fake customer key and shared secret to sites which don't support LTI it sometimes works and sometimes doesn't.
If we create an external app with a fake customer key and shared secret to sites who do support LTI, that sites automatically looks for an LTI configuration, but we don't want to use LTI for that specific site.
The ability to add an external app thats just an external url should help immensly.
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