You do not need to go anywhere to get a QR code on the State Services Portal. Everything can be done at home, if you have a confirmed data account. To check the QR code, it is necessary to point your smartphone's camera at it, and it reads all the information. You can download a specialized free application "QR Scanner".
To confirm a data account on the State Services Portal, it is not necessary to go to the Multifunctional Centre. It can be done in the bank's mobile application.