help with generated password PMPRO

hi there,

i modified this code because i would send credential only to paypal users when get the checkout.
in my code seem don’t recognizes the gateway paypal.

am i wrong ?

function my_generate_passwords()

{

    //get primary gateway
    $setting_gateway = get_option("pmpro_gateway");

	if(!empty($_REQUEST['username']) && empty($_REQUEST['password']) && $setting_gateway == "paypalexpress")

	{

		$_REQUEST['password'] = pmpro_getDiscountCode() . pmpro_getDiscountCode();	//using two random discount codes

		$_REQUEST['password2'] = $_REQUEST['password'];

	}

        else {

		$_REQUEST['password'] = pmpro_getDiscountCode(); //using two random discount codes

		$_REQUEST['password2'] = $_REQUEST['password'];

        }

return $gateways;
}

add_action("init", "my_generate_passwords");

https://www.ads-software.com/plugins/paid-memberships-pro/