https://www.reuters.com/article/us-health-coronavirus-europe-pass-factbo/factbox-how-the-eus-digital-health-pass-scheme-would-work-idUSKBN2CD1DD

Europe plans to launch a digital health pass scheme in June that it hopes will save this summer's holiday season by making it possible for travellers to prove they have been vaccinated against, or tested negative for, COVID-19.