curl --request POST \
  --url http://localhost:8080/cabinet/admin/users/{user_id}/referral-commission \
  --header 'Content-Type: application/json' \
  --data '
{
  "commission_percent": 50
}
'

{
  "success": true,
  "message": "<string>",
  "old_commission_percent": 123,
  "new_commission_percent": 123
}