saywork

Hello every one, I just started my iptv business and i am trying to understand few things . I am using smarters addon , and when i add a reseller i have to enter the reseller domain or register with a new one. my question is , how does the server connects to the domain? it means that when the reseller sell product the system automatically detect that this domain sold something and connects it to the reseller user from WHMCS? Thanks alot, Ivan.