src/Module/Authentication/LocalAuth/LocalAuth.php
protected function handleRegistration(Request $httpRequest)
    {
        $registration = $this->picoAuth->getContainer()->get('Registration');
        $registration->setConfig($this->config)
            ->handleRegistration($httpRequest);
    }
protected function handleRegistration(Request $httpRequest)
    {
        $registration = $this->picoAuth->getContainer()->get('Registration');
        $registration->setConfig($this->config)
            ->handleRegistration($httpRequest);
    }
On registration request

@param Request $httpRequest