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{  "id": "http://institution.canvas.com/api/lti/courses/5/line_items/2",
  "scoreMaximum": 50,
  "label": "50",
  "tag": "50",
  "resourceId": "50",
  "resourceLinkId": "50",
  "https://canvas.instructure.com/lti/submission_type": {    "type": "external_tool",    "external_tool_url": "https://my.launch.url"  },  "https://canvas.instructure.com/lti/launch_url": "https://my.tool.url/launch"}