LTI not storing custom values in session data

[NathanGoodwin]

I am in the process of creating an LTI tool, and part of what I need is data from the LTI launch.

I have it set up so I can click the link in the user managment and it launches the site as expected. However, I can't find the canvas user id in the session data anywhere. I checked both in my backend session table (I'm using Django) and in the cookies, and am unable to find the value. 

In the LTI key setup, I did add a custom field to return the canvas user id.

Thanks in advance!

[pvemula]

@NathanGoodwin  I am guessing that your using LTI 1.3. 

In the Launch data that you get from Canvas you should be having a param [id_token] which is a JWT. If you decode the JWT you will find the claims 

• Claim[sub] - This is the Canvas user ID
• Claim[https://purl.imsglobal.org/spec/lti/claim/custom] - This claim would have your custom params.