Plug-ins for use together with INVOICES must have a Connect and a Disconnect method and can have a ConfigurePlugin method.
Windows Vista, Windows 7, and Windows Server 2008 R2: Plug-ins for INVOICES running on the newer operating systems must have the IsVistaConverted method. See also: Migrating INVOICES customizations to recent operating systems.
The Subscribe method in INVOICES’ API is specifically designed to be called by plug-ins.
Using an ActiveX object as an INVOICES extension
Registering ActiveX objects in Windows