“This is a guidance document for countries and implementing partners on the technical requirements for developing digital information systems for issuing standards-based interoperable digital certificates for COVID-19 vaccination status, and considerations for implementation of such systems, for the purposes of continuity of care, and proof of vaccination.”
https://www.who.int/publications/i/item/WHO-2019-nCoV-Digital_certificates-vaccination-2021.1
Once the digital platform is in place, it will naturally be used for many other purposes, including digital currency systems and financial information. How much power/control should be given away?