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I think you still need to collect VAT ID on your website and associate it to a stripe customer

Nope, no need! Tax ID is validated when you accept the payment: https://stripe.com/docs/tax/checkout#create-session.

Precision: if you're using Stripe checkout only. On a custom integration you do need to get the customer VAT ID and add it to your Stripe customer

Wao! Does it works for metered-usage plans too?