List discounts

Example response

{
  "data": [
    {
      "id": "2510177931054358528",
      "name": "TRIPDISCOUNT",
      "amount": 40,
      "quantity": 10,
      "discount_type": "percentage",
      "duration": {
        "duration_reference": "absolute",
        "start_date": "2025-08-01",
        "end_date": "2025-08-15",
        "start_offset_days": 30,
        "end_offset_days": 20
      },
      "created_at": 1445443
    }
  ]
}