The ltik is issued by LTIAAS at the end of a launch and appended to your application's launch URL. It represents that one launch, and combined with your API key it authenticates calls made in its context.
It expires 24 hours after the launch that created it. For work that happens later — a nightly grade submission, a course that runs for a week — use a service key instead.
It is specific to LTIAAS, not part of the LTI® specification. See authenticating API requests.
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