curl --request GET \
  --url https://api.smartermeasure.com/v3/users/{userid} \
  --header 'Authorization: Basic <encoded-value>'

{
  "UserId": "10000001",
  "FirstName": "Alice",
  "LastName": "Carter",
  "Email": "alice.carter@example.com",
  "InternalId": "STU-001",
  "AccessCode": "Xk9mPqRt",
  "HowManyCourses": [],
  "AgeRange": [],
  "Gender": [],
  "CompletionPercentage": "0",
  "DateTimeStarted": "2026-03-20T18:40:08Z",
  "DateTimeLastUpdated": [],
  "DateTimeCompleted": [],
  "Uri": "/users/10000001",
  "CustomData": [
    {
      "QuestionId": "611",
      "ParameterId": "coid",
      "Response": []
    },
    {
      "QuestionId": "612",
      "ParameterId": "dcc",
      "Response": []
    },
    {
      "QuestionId": "1972",
      "ParameterId": "custom_canvas_user_id",
      "Response": []
    },
    {
      "QuestionId": "2172",
      "ParameterId": "SessionSid",
      "Response": []
    }
  ]
}