curl --request GET \
  --url https://api.example.com/fixtures/validation \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Api-Token: <api-key>'

{
  "snapshot": {
    "Ts": 123,
    "StartTime": 123,
    "Competition": "<string>",
    "CompetitionId": 123,
    "FixtureGroupId": 123,
    "Participant1Id": 123,
    "Participant1": "<string>",
    "Participant2Id": 123,
    "Participant2": "<string>",
    "FixtureId": 123,
    "Participant1IsHome": true
  },
  "summary": {
    "fixtureId": 123,
    "competitionId": 123,
    "competition": "<string>",
    "updateStats": {
      "updateCount": 123,
      "minTimestamp": 123,
      "maxTimestamp": 123
    },
    "updateSubTreeRoot": "<string>"
  },
  "subTreeProof": {},
  "mainTreeProof": {}
}