On BigCommerce, UndoPortal is a hosted withdrawal form you add as a Web Page: enter your domain and notification email, copy the embed snippet, and paste it into a new storefront page — no Stencil edits.
Create the page under Storefront → Web Pages and paste the UndoPortal iframe snippet — live in roughly two minutes.
Nothing touches your Stencil theme or checkout, so the withdrawal button stays compliant through theme and platform updates.
Customers receive the required durable-medium confirmation automatically, and every request is stored in an exportable audit trail.
On a dedicated storefront Web Page you create, which you then link prominently from your footer and order confirmation emails so it's reachable throughout the 14-day window.