For possible browser compatibility.
Via mail, HTTP or DNS of your domain.
For any number of hosts within one domain.
All prices are final prices. As small business according to §19 German UStG no VAT is billed.
Standard certificates are valid for one particular hostname and the domain itself (e.g. www.example.com and example.com). Wildcard certificates secure any number of direct subdomains within one domain (e.g. *.example.com and example.com).
According to current policies by the CAB forum the validity period of newly issued certificates has to be limited to one year. When ordering longer periods the certificate needs to be re-issued after one year at not additional charge.