Php code for "Email will be username"

-- HikaShop version -- : 4.7.5
-- HikaMarket version -- : 4.1.1
-- Joomla version -- : 4.3.3
-- PHP version -- : 8.0.29

Market options > Registration options > Email will be username > YES

In the registration.php file there is the condition if($this->config->get('registration_email_is_username', 0) == 0)

In that php file there is the code that "copy" the value of the email in the username field ??

Thanks

Hi Jerome, it's all clear to me

I would like to know in which php file there is the code that "copy" the value of the email in the username field