Integrating computer systems
Computer systems rarely add that much value in isolation, so we would look at sensible integration points between any new software system and existing, or newly-adopted, systems you have. We have particular experience integrating business applications with Sage 50 Accounts in this area, but we will look into any required integration.
Past integration experience includes plenty of REST applications such as Exact and Bullhorn, and those principles would apply to any other system offering the same sort of interface. That would include Xero, Quickbooks and other similar online products.