Starting July 1st, all European Union countries will be accepting the digital certificates as proof that the traveler has been vaccinated, has tested negative, or has recovered from COVID in the last 180 days. The traveler will hold a QR code that will be read upon arrival. However, each EU country is responsible for the definition of its own entry requirements and rules, which are not standardized throughout the territory. The digital certificate should facilitate entry in airports, train stations, and ports.