Jens Spahn (CDU), Federal Minister of Health, shows the Corona Warn app with a sample digital vaccination certificate as well as his own old vaccination certificate at the regular press conference on the Corona situation in Berlin, Germany, Thursday, June 10, 2021. One of the topics is the digital vaccination certificate. (Michael Kappeler/dpa via AP)

Jens Spahn (CDU), Federal Minister of Health, shows the app for the digital vaccination certificate at the regular press conference on the Corona situation in Berlin, Germany, Thursday, June 10, 2021. (Michael Kappeler/dpa via AP)