Law 39/2015:
Article 14. Right and obligation to interact electronically with public administrations . "
"1. Natural persons may at any time choose whether or not to communicate with public administrations in order to exercise their rights and obligations by electronic means, unless they are obliged to communicate by electronic means with public administrations. The means chosen by the person to communicate with the public administrations may be modified by the person at any time.
2. In any case, at least the following subjects are obliged to communicate with the public administrations through electronic means in order to carry out any procedure of an administrative procedure:
a) Legal entities.
b) Entities without legal personality.
c) Those who carry out a professional activity for which compulsory membership is required, for the procedures and actions they carry out with the public administrations in the exercise of the aforementioned professional activity. In any case, this group includes notaries and registrars of property and commercial property.
d) Those who represent an interested party who is obliged to interact electronically with the Administration.
e) Employees of public administrations for the procedures and actions they carry out with them due to their status as public employees, as determined by regulations of each Administration. 3. By regulation, administrations may establish the obligation to interact with them through electronic means for certain procedures and for certain groups of individuals who, due to their economic, technical capacity, professional dedication or other reasons are proven to have access to and availability of the necessary electronic means. ”
Article 54. Initiation classes.
"Proceedings may be initiated ex officio or at the request of the interested party."