e-vaccination certificate

Earlier in the year we spoke about immunity certificates which might be issued to those who had contracted COVID-19 and then recovered.  It was assumed that they would then be immune from the disease and could safely take up activities such as returning to work.  Some doubt was cast on whether having the disease conferred immunity on the patient, and, even if it did, no one knew for how long.

 So now when there is the possibility of a vaccine opening up international travel again, the WHO is wary of asking for an immunity certificate and will simply require a confirmation of vaccination certificate.  This is an e-certificate to facilitate the process of having it verified at the airport.  The software must be compatible across all countries.  It is preferable to immunity passports (which are  of doubtful value) and antigen testing at the airport (which is somewhat variable in its results).