Submit performance report

curl --request POST \
  --url https://example-supplier.co.uk/v1/report \
  --header 'Content-Type: application/json' \
  --header 'X-Supplier-API-Key: <api-key>' \
  --data '
{
  "reporting_period_start": "2026-11-01T10:00:00.000Z",
  "reporting_period_end": "2026-11-01T10:00:00.000Z",
  "tariff_requests": 4823100,
  "tariff_changes": 12,
  "availability_pct": 99.97,
  "success_pct": 99.82,
  "response_time_ms": {
    "p50": 120,
    "p95": 820,
    "p99": 1450
  }
}
'

{
  "code": "tariff_not_found",
  "message": "No tariff found for the given tariff_id and supplier MPID.",
  "details": "tariff_id a1b2c3d4-e5f6-7890-abcd-ef1234567890 does not exist for supplier SEBD."
}