How can I sign eDocument: identification methods
You can sign electronic documents by Mark Sign using different identification methods. Su can verify your identification with your qualified Smart-ID, Mobile-ID, ZealiD apps, USB token, or Smart Cards.
Signing a document with a qualified electronic signature should use all signing members.
NB: the login and signing documents verification methods are the same. When you log in to the self-service, you need to enter the PIN1 code, while signing a document - PIN2.