How to link a PayPal button to a server-side checkout page on Webflow Cloud

A Webflow Cloud and Next.js 15+ integration can connect a Webflow marketing-page button to a PayPal checkout flow in which prices are set securely on the server and payments are captured when buyers return from PayPal. The process requires a Webflow site, PayPal sandbox or live REST credentials, Node.js with npm, a connectable Next.js repository, and a sandbox buyer account for testing; the app is mounted at a path such as `/checkout` and uses environment variables for credentials, return and cancel URLs, API endpoints, and the public base path. A server-side Route Handler creates fixed-price PayPal orders, while a client-side button requests the order and redirects buyers to PayPal; a return page verifies and captures the order, accounting for completed or pending captures and using an idempotency header to avoid duplicate charges. Deployment involves setting Webflow Cloud’s mount path before building, adding matching environment variables, linking the Designer button to the relative checkout path, and testing the complete sandbox flow. Common issues include unsupported Next.js Edge runtime declarations, missing client-side base paths that cause live 404 errors, sandbox and live credential mismatches, and site-plan limitations on custom-domain app mounts. Suggested enhancements include retrieving prices from Webflow CMS data, adding webhook-based capture and verification, or using simpler PayPal or Stripe options when server-side logic is unnecessary.

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