{"iss"=>"what is an audience?", "login_hint"=>"504068", "target_link_uri"=>"https://lti-ri.imsglobal.org/lti/tools/2721/launches", "lti_message_hint"=>"69072", "client_id"=>"just a tribute", "lti_deployment_id"=>"a long lonesome road"}

response_type: id_token (required, the tool must use a value of id_token)

redirect_uri: https://lti-ri.imsglobal.org/lti/tools/2721/launches (required, This URI must exactly match a value pre-registered with the platform)

response_mode: form_post (required, tools and platforms must support a value of form_post)

client_id: just a tribute (required, client identifier valid at the Platform)

scope: openid (required, must contain the openid scope value)

state: eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImY4YkQtUElGNm9FQmlueVBGSnRVT0k0d3VTbXBQU1VaWXV0Z01fV3FEUEkiLCJ0eXAiOiJKV1QifQ.eyJ0b29sX2lkIjoyNzIxLCJzdGF0ZV9ub25jZSI6IjRlMGMwNTNmZmU0NGMxNzUwNTk1IiwicGFyYW1zIjp7ImlzcyI6IndoYXQgaXMgYW4gYXVkaWVuY2U_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.KWpU3pGsO853B-mWTAABPl4fFJJQxxkGBQ6509dXJ2rJe_ukrwIAP-biGbXWKFpusYj4VdOvHIwHocWoSpmFCWWjW4TjxAOgyBvqhJACFQp5p7ZoBFr_u29rzzokCjEXNUXbxIXituC0gdE0vseYq5d2hQEEdee9X6brAv4gglGD7RTxdzqVV9Ivw8-OaPWwkwgvU0mlMY-1lpaGR8EdGr5Ge__UyNKqmIzrAJrq8jgexeDbqmi8I4Z-moRRchhwCwDGPllgbtpJVCHiuZHkwlow8RYg0C12skbMWm-rX-EYKemkhyY8Mf-F0U-qjtVNPDDSfLqvPUBAJyqYydUrUQ (required, opaque value used to maintain state between the request and the callback)

login_hint: 504068 (required, tools and platforms must support a value of form_post)

lti_message_hint: 69072 (required, a platform opaque identifier identifying the user to login)

prompt: none (optional, The tool should use a value of none. In the future a re-launch flow may support additional values being used here)

nonce: 4e0c053ffe44c1750595 (optional, string value used to associate a client session with an ID token, and to mitigate replay attacks)

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