set default devicemanager endpoint as /dm/execute. As stated in VCHASNO docs.

api/client.go

@@ -40,6 +40,6 @@ func NewDMClient(token, dmURL, device string) *Client {
 		device:         device,
 		resty:          restyClient,
 		apiBaseURL:     dmURL,
-		fiscalEndpoint: "/dm/fiscal",
+		fiscalEndpoint: "/dm/execute",
 	}
 }