A domain name is an identification string that defines a realm of administrative autonomy, authority, or control on the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Technically, any name registered in the DNS is a domain name.
I am quite new to creating services using PHP-cURL. So now I want to offer some data/service to only registered domains. Now I know that I can identify this domains using app ID and API keys for data ...