curl --request POST \
  --url https://upay-sistema-api.onrender.com/api/coupons/validate \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>",
  "amountCents": 2,
  "productIds": []
}
'

{
  "valid": true,
  "discountAmount": 123,
  "finalAmount": 123,
  "coupon": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "code": "<string>",
    "discountType": "PERCENTAGE",
    "discountValue": 123,
    "description": "<string>",
    "minPurchaseCents": 123,
    "maxDiscountCents": 123,
    "usageLimit": 123,
    "perUserLimit": 123,
    "validFrom": "2023-11-07T05:31:56Z",
    "validUntil": "2023-11-07T05:31:56Z",
    "status": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z"
  }
}