Apple Pay: allow payment without filling required fields in checkout form

Hi there.

I have an issue with the Apple Pay payment method: allow the user to complete the purchase without filling out the required fields in the Billing Checkout form.

This started to happen 6/7 days ago. I was working fine before that date.

Can you tell me how to fix this?

Thanks.

The page I need help with: [log in to see the link]