The country, and TLD, and type-of-business (active registered company, DBA, sole prop, onion), and other logic (detecting inconsistencies between data sources, determining if whois privacy is in use, etc) are implemented and documented in source code - CertSimple itself is an engine to meet those rules and handle those exceptions.

The requirements for EV itself are in CABForum docs, see https://certsimple.com/blog/are-ev-ssl-certificates-worth-it for an overview.