-int stgInstantiateImpl(const char * server, uint16_t port, const char * password);
-const STG_PAIR * stgAuthorizeImpl(const char * userName, const char * serviceType);
-const STG_PAIR * stgAuthenticateImpl(const char * userName, const char * serviceType);
-const STG_PAIR * stgPostAuthImpl(const char * userName, const char * serviceType);
-const STG_PAIR * stgPreAcctImpl(const char * userName, const char * serviceType);
-const STG_PAIR * stgAccountingImpl(const char * userName, const char * serviceType, const char * statusType, const char * sessionId);
-
-void deletePairs(const STG_PAIR * pairs);
+int stgInstantiateImpl(const char* address);
+STG_RESULT stgAuthorizeImpl(const char* userName, const char* password, const STG_PAIR* vps);
+STG_RESULT stgAuthenticateImpl(const char* userName, const char* password, const STG_PAIR* vps);
+STG_RESULT stgPostAuthImpl(const char* userName, const char* password, const STG_PAIR* vps);
+STG_RESULT stgPreAcctImpl(const char* userName, const char* password, const STG_PAIR* vps);
+STG_RESULT stgAccountingImpl(const char* userName, const char* password, const STG_PAIR* vps);