a) Define prices for each zone. Notice that prices are defined per zone only (you can't define a price for a registrar/zone combination). For example: fred-admin --price_add --operation_price 80.00 --zone_fqdn tld --operation CreateDomain fred-admin --price_add --operation_price 80.00 --zone_fqdn tld --operation RenewDomain fred-admin --price_add --operation_price 80.00 --zone_fqdn tld --operation EppOperation Take into account that the system registrar must be defined as such and that these prices do not apply to the system registrar b) Add invoice prefixes: fred-admin --invoice_add_prefix --zone_fqdn tld --prefix 01 c) Now you can start assigning credit like this: fred-admin --invoice_credit --zone_id 1 --registrar_id 2 --price 2000.0 The zone_id usually is the TLD zone. The registrar_id usually starts with 2 for non-system registrars. I' m supposing you are using a pre-paid policy. FRED allows for post-paid, too. d) Now you can use fred-client with the new registrar (I' m assuming that you previously created the regitrar with fred-admin and assigned the zone to that registrar): fred-client --user=<registar handle> --password=<registar password) --cert=/usr/share/fred-client/ssl/<registar handle>.crt --privkey=/usr/share/fred-client/ssl/<registar handle>.key (for easier administration, we use for the crt and key files the same name that the registrar one) e) Now create, renew, etc. domains: create_domain guerra.tld <contact id.> NULL <nsset id.> NULL (1 y) I' m assuming that you previously created both the contact and the nsset ids. After this, for each domain created or renewed, that price is deduced from the credit. If you use pre-paid and the accululative operations exceed the credit, a FRED error is given.