The MSTosite application is only for MST-Yhtiöt Oy's customers. Use of the application requires a valid customer relationship and login with the provided IDs. With the help of the application, you deliver your company's accounting documents directly to your accountant at Tilitoimisto MST-Yhtiöt Oy. Take a picture of the receipt / voucher or download the voucher from your terminal and send. The receipt has been submitted and will be available to your accountant immediately. For more information about the application, contact the accounting firm MST-Yhtiöt Oy.