Not unless you want to upgrade your interface to include access to newer features and functionality. PC*MILER Web Services will continue to maintain support for existing APIs in future releases, unless otherwise notified in advanced. There may be, however, slight modifications and fixes made so proper testing of your interface is always recommended. If new features are added, the WSDL will change so please monitor your interface closely. New feature descriptions are always included in the beginning of the PC*MILER Web Services User’s Guide.