script to automaticly create google calendar event according to \"meeting form\"

i have website for renting items, i create "renting events" in google calendar to know who come and return when and whot. so far manualy according to filled email form "subject: WHO& WHAT +FROM-TO. i want to create it automaticly without any assistance from my side in my google calendar when the form is sent from website. it has probably something to do with "google calendar API" + the same thing to create automaticly without my assistance new contact if phone number is filled (and exclude exisiting contacts based on phone number) in my google contacts page.