استخراج بيانات الإيصالات

{
  "document_type": "receipt",
  "shop": {
    "name": "Mercadona",
    "branch": "Valencia Ruzafa"
  },
  "purchased_at": "2026-09-14T18:22:00",
  "currency": "EUR",
  "payment_method": "card",
  "items": [
    {
      "description": "Leche entera 1 L",
      "quantity": 6,
      "unit_price": 0.89,
      "total": 5.34
    },
    {
      "description": "Aceite de oliva virgen extra 1 L",
      "quantity": 1,
      "unit_price": 7.45,
      "total": 7.45
    },
    {
      "description": "Pan de payés",
      "quantity": 2,
      "unit_price": 1.65,
      "total": 3.3
    }
  ],
  "discounts": [
    {
      "description": "Cupón panadería",
      "amount": -0.5
    }
  ],
  "total": 15.59
}