What “green mode” means?

Galerija Centrs stores operating in “green mode” have green sticker sign at the entrance. This means that all staff working with customers in person have been vaccinated against or have contracted Covid-19, and all visitors must present a Covid-19 certificate and ID before entering the area. Valid documents are: passport, ID card, driver’s license, student card, schoolchildren card, pensioners’ card, retirement pension card.