Retrieve a usage record

{
  "id": "string",
  "organization_id": "string",
  "test_mode": true,
  "run_id": "string",
  "session_id": "string",
  "dimension": "llm_tokens_input",
  "quantity": -2147483648,
  "provider_cost_micros": -9007199254740991,
  "provider": "string",
  "model": "string",
  "idempotency_key": "string",
  "metadata": {
    "property1": null,
    "property2": null
  },
  "created_at": "string",
  "object": "usage_record"
}