POST /v1/transactions — 201 Created

{
  "id": "txn_9xK2mP8qR",
  "status": "completed",
  "amount": 8450,
  "currency": "USD",
  "line_items": [
    {
      "sku": "ITEM-042",
      "qty": 3,
      "unit_price": 2150
    }
  ],
  "latency_ms": 38
}

{
  "sync_id": "sync_7tN3vQ",
  "location_id": "loc_sf_01",
  "deltas": [
    {
      "sku": "ITEM-042",
      "prev": 120,
      "current": 117,
      "delta": -3
    }
  ],
  "synced_at": "2026-02-25"
}

{
  "event": "transaction.completed",
  "seq": 847293,
  "payload": {
    "txn_id": "txn_9xK2mP8qR",
    "amount": 8450,
    "merchant": "loc_sf_01"
  },
  "timestamp": "2026-02-25T20:21:45.540Z"
}