What the storefront controls•Which experiences a customer can pick for an experience gift card — only the ones listed on that storefront.
•The payment methods and storefront settings the widget loads.
•The terms and privacy links shown in the consent text, which point at that storefront’s domain.
•The storefront the purchase is attributed to — the ID is sent along with the payment.
If you leave it outUnderstory resolves a storefront for the company on its own. That is fine when a company has a single storefront — set the attribute explicitly whenever there is more than one, otherwise the widget may pick up settings and links from the wrong one.
Where to find the IDIn Backoffice under Storefronts → Implementation, the generated embed snippet already contains data-storefront-id for the storefront you pick. The ID is also the one in the URL while editing a storefront: /storefronts/<storefront-id>/edit.