What id can be used to identify the same user/course through REST API, GraphQL API and LTI Launch?

[eduardo14]

Hi All,

I have been exploring the IDs returned for users and courses through the various access points to data, and I have so far been unable to understand what IDs I can use to uniquely identify the same user for the results of REST API, GraphQL API and LTI Launch. 

Could someone please point me to the right direction?

Thanks,

[dtod]

These might help:

https://canvas.instructure.com/doc/api/file.object_ids.html

https://canvas.instructure.com/doc/api/file.tools_variable_substitutions.html 

LTI 1.1 and 1.3 pass custom variables differently iirc. You can see the details of a 1.1 launch in your browser. For a 1.3, you'll have to pass it through a base64 decoder.