curl --request GET \
  --url https://backstage.example.com/api/soundcheck/certifications

{
  "certifications": [
    {
      "entityRef": "<string>",
      "track": {
        "id": "<string>"
      },
      "levels": [
        {
          "ordinal": 123,
          "name": "<string>",
          "entityRef": "<string>",
          "checks": [
            {
              "id": "<string>",
              "name": "<string>",
              "description": "<string>",
              "entityRef": "<string>",
              "timestamp": "<string>",
              "details": "<unknown>"
            }
          ],
          "certified": true,
          "description": "<string>"
        }
      ],
      "highestLevel": {
        "ordinal": 123,
        "name": "<string>",
        "entityRef": "<string>",
        "checks": [
          {
            "id": "<string>",
            "name": "<string>",
            "description": "<string>",
            "entityRef": "<string>",
            "timestamp": "<string>",
            "details": "<unknown>"
          }
        ],
        "certified": true,
        "description": "<string>"
      }
    }
  ]
}