You pay in Shopify's secure checkout with the payment methods available in your country, Shop Pay included. Prices include VAT, and we prepare the order once the payment is confirmed.
Every order comes with a VAT invoice. If you buy as a business, give us your company name, tax ID and billing address with the order and we invoice your company. Intra-EU orders with a VAT number valid in VIES are invoiced without VAT under the reverse charge.