// resgister new customer
$customer = new Customer($username);
$customer->setName($name)
         ->setPasswd($pass)
         ->etc();
// ...         
$customerManager = $this->getService('bxav_reseller_club.customer_manager');
$customer = $customerManager->register($customer);


// check domain availability
$domainRegister = $this->getService('bxav_reseller_club.domain_register');
$bool = $domainRegister->isDomainAvailable($domain, $tld);

// resgister new domain
$domainRegister = $this->getService('bxav_reseller_club.domain_register');
$registrationResponse = $domainRegister->register($domain, $tld, $customer);