EV certificates require a more stringent verification process than OV certificates. To understand the basis of this procedure, please refer to the above question about OV certificate verification. Please note that EV certificates require you to complete a few extra steps, including proving both physical and operational existence as well as completing a simple telephone call with the Certificate Authority (CA) directly.
Related posts:
Do I need to provide my business verification document again for renewing my OV/EV SSL certificate?
What is an Extended Validation (EV) SSL Certificate?
If I buy an Organization Validated (OV) SSL Certificate, which document(s) do I need to provide?
If I buy a Code Signing Certificate, which document(s) do I need to provide?
