Add basePath to mux

server.go

@@ -10,19 +10,25 @@ import (
 
 type Server struct {
 	*http.ServeMux
-	Logger log.Logger
+	basePath string
+	Logger   log.Logger
 }
 
-func NewServer(mux *http.ServeMux, logger log.Logger) *Server {
+func NewServer(mux *http.ServeMux, basePath string, logger log.Logger) *Server {
 	if mux == nil {
 		mux = http.NewServeMux()
 	}
 	return &Server{
 		ServeMux: mux,
+		basePath: basePath,
 		Logger:   logger,
 	}
 }
 
+func (s *Server) Handle(pattern string, handler http.Handler) {
+	s.ServeMux.Handle(s.basePath+pattern, handler)
+}
+
 func (s *Server) RegisterCallbackServer(srv server.CallbackServer) {
 	s.Handle(server.CallbackEndpoint, server.NewServer(server.CallbackRequest{}, []string{http.MethodPost}, s.Logger, func(req server.Request) (res server.Response, errRes server.ErrorResponse) {
 		callbackRequest, ok := req.(*server.CallbackRequest)