A certificate must be issued by one of the providers listed below. Requirements identical from the OECD (CTS).

PUBLIC KEY INFRASTRUCTURE (PKI)

Current list of approved Certificate Authorities and Products Certificate Product
Approved for the Solution:
Certificate Authority
Digicert®  EV SSL Plus (Single Name)
https://www.digicert.com/ev-ssl-certification.htm
Symantec/Verisign® Secure Site with EV SSL
https://www.symantec.com/ssl-certificates/secure-site-ev/
Entrust® EV Multi Domain SSL
https://www.entrust.com/ev-multi-domain-ssl-certificates/
GlobalSign® Extended SSL
https://www.globalsign.com/en/ssl/ev-ssl/