[Observium] some queston before purchase

Hi, i want purchase your professional plan i have some questions : 1. we have our own traffic accounting in your simple api can we check every switch port how much send/receive or total traffic have?or can we set in your traffic accounting that when switch use over X tb per month call a script (our script will create invoice in our billing system) if we can check traffic in + traffic out with your simple api we can create overage invoice in our billing system and we want this, 2. can we create alert that when traffic use near %80 percent of X tb per month send email to user? thanks,