If you are developing Apex classes, triggers or Visualforce controllers, you may call the FinancialForce Apex classes directly to integrate with FinancialForce. You do not need to go via the Web Services interface.
See "Documentation Resources for Force.com Developers" in the
Salesforce Help for more information.
To view a list of all the relevant Apex classes:
A list of all relevant Apex classes is displayed.