A billing reseller is a reseller for which the subscription life cycle is managed by the Xopero system - subscriptions have expiration dates.
A product reseller is a reseller that resells Xopero products.
Parameter reseller can create their own products and are billed for used resources.
Reseller has access to the panel in Read Only mode. Reseller can view lists of its customers and sold subscriptions.
It is a reseller who controls the validity of the subscription and uses the API to create users. It does not have rigidly assigned products, each parameter is given in the API call. Its clients do not need to have a license expiration date.