Hook Requested on checkout page

[Craft]

Hello,
Could someone help me create a hook on the checkout page that prevents the customer from completing the order if he filled out any of these fields (Address 1, City, State, Postal Code, and Phone Number)?

[WhmTools]

You mean prevent them from placing the order if they didn't enter Address 1, City, State, Postal Code, and Phone Number?

[Craft]

3 hours ago, WhmTools said:

You mean prevent them from placing the order if they didn't enter Address 1, City, State, Postal Code, and Phone Number?

No, my post is correct.

I want the hook to not proceed with an order if the customer fills out any of these fields (Address 1, City, State, Postal Code, and Phone Number).
I already hide them by CSS, but some script hackers can still fill out these fields to complete fake orders.

Edited August 25 by Craft

[DennisHermannsen]

<?php

add_hook('ShoppingCartValidateCheckout', 1, function($vars) {
    if (!empty($vars['address1']) || !empty($vars['city']) || !empty($vars['postcode']) || !empty($vars['phonenumber'])) {
        return ['gotcha!'];
    }
});

 

[Craft]

On 8/26/2024 at 1:32 AM, DennisHermannsen said:

<?php

add_hook('ShoppingCartValidateCheckout', 1, function($vars) {
    if (!empty($vars['address1']) || !empty($vars['city']) || !empty($vars['postcode']) || !empty($vars['phonenumber'])) {
        return ['gotcha!'];
    }
});

 

Thanks @DennisHermannsen for the hook, it solved my issue 🙂

Can we create the same hook code for the Register page?