.buddhaha

[opaque agate]

You are using Stripe Checkout

[hard mauve]

yes

[opaque agate]

There is no option to make it required in Checkout Session:
https://stripe.com/docs/api/checkout/sessions/create#create_checkout_session-tax_id_collection

You can use Elements and build your own form to collect VAT number and make it required

[hard mauve]

Okay, thanks 🙂