curl --request POST \
  --url https://studio-api.onlytraffic.com/api/external/v1/accounts/{username}/promo-texts/{id} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "text": "<string>"
}
'

{
  "success": true,
  "data": {
    "id": 123
  }
}