WHO publishes Digital Documentation of COVID-19 Certificates

Source:

• 
  August 27, 2021. “Digital Documentation of COVID-19 Certificates: Vaccination Status: Technical Specifications and Implementation Guidance, 27 August 2021.” WHO/2019-nCoV/Digital_certificates/vaccination/2021.1. World Health Organization.
  https://www.who.int/publications-detail-redirect/WHO-2019-nCoV-Digital_certificates-vaccination-2021.1.
  World Health Organization, PDF.
  This is a link to the download page.

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