How does billing work with HubSpot?

HubSpot bills directly for services, Arcalea will invoice separately for integration and monthly management.

The simple answer is HubSpot bills directly for access to their platform. Any agreement signed with HubSpot is generally for an annual service, predicated on any terms with HubSpot and is generally charged to credit card and paid either quarterly, or annually in advance. 

HubSpot additional billing information can be found here.