perch shop PayPal passwordless purchase

Hello I understand I can have customers purchase through PayPal express without being members and having a password.

But how would I integrate this into the checkout process?|

I have my checkout page (checkout.php)

<?php
if (perch_member_logged_in()) {

  // your 'success' return URL
  $return_url = '/shop/payment.php';
  $cancel_url = '/';

  perch_shop_checkout('paypal-express', [
    'return_url' => $return_url,
    'cancel_url' => $cancel_url,
  ]);
}
?>

And payment page...

<?php perch_shop_complete_payment('paypal-express');  if (perch_shop_order_successful()) { echo '<h1>Thank you for your order!</h1>'; }else{ echo '<h1>Sorry!</h1>'; } ?>

How would I include this

<?php
  perch_shop_registration_form([
    'template' => 'checkout/customer_create_passwordless.html'
  ]);
?>

Thanks!