curl --request POST \
  --url https://api.useduro.com/v1/promo-codes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "LAUNCH50",
  "discountValue": 123,
  "planId": "<string>",
  "duration": "once",
  "durationCycles": 123,
  "maxRedemptions": 123,
  "expiresAt": "2023-11-07T05:31:56Z"
}
'

{
  "id": "<string>",
  "code": "<string>",
  "discountType": "<string>",
  "discountValue": 123,
  "duration": "<string>",
  "redeemedCount": 123,
  "remaining": 123,
  "active": true,
  "expiresAt": "<string>",
  "createdAt": "<string>"
}