WildCard SSL Certificates authenticate a domain and all of its sub-domains.
WildCard SSL Certificates with only domain name verification (Comodo Positive SSL Wildcard, AlphaSSL WildCard Certificate, RapidSSL® WildCard) are issued automatically without any documents. Just after the payment and CSR request they are ready to be used within 5 minutes.
More expensive WildCard SSL certificates can be issued only to a legal entity from 2 to 10 days.
WildCard SSL certificates ensure about 99.3 percent browser recognition rates and support payment method by plastic cards VISA / MASTER CARD.