Xero is integrating its financial application with time tracking and invoicing software from Harvest, a New York City-based cloud vendor. It is part of a steady stream of extensions of functionality via acquisition or integrations added by New Zealand-based Xero over the last year. The acquisitions include practice management company, Max Solutions Holding, and Australian online payroll company, PayCycle, while the integrations include links to Bill.com, Automatic Data Processing.