curl --request PUT \
  --url https://api.ofauth.com/v2/access/promotions/:promotionId \
  --header 'Content-Type: application/json' \
  --header 'apiKey: <api-key>' \
  --header 'x-connection-id: <api-key>' \
  --data '
{
  "discount": {
    "type": "free_trial",
    "durationDays": 15
  },
  "offer": {
    "limit": 50,
    "expirationDays": 15
  },
  "message": "<string>"
}
'

{
  "id": 123,
  "message": "<string>",
  "rawMessage": "<string>",
  "hasRelatedPromo": true,
  "price": 123,
  "canClaim": true,
  "claimsCount": 1,
  "subscribeCounts": 1,
  "subscribeDays": 1,
  "createdAt": "<string>",
  "finishedAt": "<string>",
  "isFinished": true
}