We would like to use the student id attribute of our student users in LTI linked systems. To do so we need a context variable for student id which we can use in the Tool Provider Custom Parameters part of the LTI-setup. For a students username the variable @X@user.id@X@ is available and we would love to have something like @X@student.id@X@ for student id.
This is because the student id is used as the primary identification attribute for our users across the various systems we use (and in our SIS).
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