Federico

I have a similar need as above. All our customers need to be billed on 1st January of each year, independently of when they subscribed to the service. As far as I understood, I need firstly to let them pay 1 year of service, then I could schedule an automatic "sync" that extend any service expiring during the year to the 31st December. Is it possible with a script/api call (manually would be too time-consuming)? Where can I find documentation?