Ligand Substitution questions

• user_id:
• roles:
• resource_link_id:
• resource_link_title:
• resource_link_description:
• lis_person_name_full:
• lis_person_name_family:
• lis_person_name_given:
• lis_person_contact_email_primary:
• lis_person_sourcedid:
• context_id:
• context_title:
• context_label:
• tool_consumer_instance_guid:
• tool_consumer_instance_description:
• lti_version:
• lti_message_type:
• oauth_callback:
• oauth_consumer_key:
• oauth_version:
• oauth_nonce:
• oauth_timestamp:
• oauth_signature_method:
• oauth_signature:

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