Marianne
Shopify Native Checkout Flow: As you have selected Shopify native checkout, all options configured in the builder — box size, flavour, sleeve, gift card design, message, delivery date, recipient address and shipping method — are passed to Shopify as cart attributes via the Shopify Cart Attributes API.
Contact
customer@example.com
Shipping address
Address pre-filled from your builder selections. You can edit if needed.
Shipping method
Payment
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Or pay with

In the live build, payment is handled by Shopify Payments / Stripe / TWINT.