On January 1, 2019, art. 7 para. 3 lett. b of the Federal Act on Value Added Tax (mail order provisions). From 15 November 2018, companies active in the mail-order business who register for value added tax, when registering online, must indicate that they act as a mail-order company and that they agree to be published in the list. The fact of appearing on this list is in the interest of mail order companies. This will avoid incorrect billing and any customer complaints.
Federal Tax Administration https://www.estv.admin.ch/estv/it/home/mehrwertsteuer/fachinformationen/regelung-fuer-den-versandhandel/versandhandel-anmeldung.html