curl --request GET \
  --url https://{instance}.domo.com/api/identity/v1/users \
  --header 'X-DOMO-Developer-Token: <api-key>'

{
  "users": [
    {
      "id": 123456,
      "displayName": "John Doe",
      "userName": "john.doe@example.com",
      "emailAddress": "john.doe@example.com",
      "roleId": 1,
      "attributes": [
        {
          "key": "department",
          "values": [
            "Engineering",
            "Product"
          ]
        }
      ]
    }
  ]
}