Overview

Swft is two things: a WordPress plugin and a hosted checkout.

The plugin intercepts the WooCommerce checkout page and redirects customers to checkout.swft.co.uk. Sessions are pre-created on cart update so the redirect lands on an already-loaded page. The checkout itself is a React application served from Cloudflare Pages, rendered by a Cloudflare Worker that injects the session as window.__SWFT_SESSION__.

Your store stays on WordPress. Only checkout moves to the edge.

Components

Component	What it does
Swft Checkout plugin	Serialises the WooCommerce cart, calls the Swft API to create a session, and redirects to checkout.swft.co.uk/{sessionId}
Swft API (api.swft.co.uk)	Validates the cart payload, creates the session in Supabase and Cloudflare KV, creates the Stripe PaymentIntent on /pay, and handles webhooks
Cloudflare Worker	Serves checkout.swft.co.uk/{sessionId} — reads session from KV (fast path) or falls back to API, injects it into the HTML shell
Checkout frontend	React SPA at checkout.swft.co.uk — two-step form, Stripe Elements, order summary, Express checkout (Apple/Google Pay)
Swft Cart	Optional free WordPress plugin — a slide-in cart drawer with 18 modules

Data flow

Customer clicks "Checkout"
  → WooCommerce checkout page
  → Swft plugin: check transient cache for pre-created session
    → HIT: instant redirect to checkout.swft.co.uk/{sessionId}
    → MISS: POST to api.swft.co.uk/sessions → get sessionUrl → redirect

checkout.swft.co.uk/{sessionId}
  → Cloudflare Worker: read session from KV
    → KV HIT: inject window.__SWFT_SESSION__ into HTML
    → KV MISS: GET api.swft.co.uk/sessions/{id} → inject
  → React app boots, reads window.__SWFT_SESSION__

Customer completes details step
  → POST api.swft.co.uk/sessions/{id}/pay
  → Stripe PaymentIntent created
  → Stripe Elements shown

Customer pays
  → Stripe webhook: payment_intent.succeeded → api.swft.co.uk/webhooks/stripe
  → WooCommerce order created via REST API (status: processing)
  → Confirmation screen shown

Requirements

Requirement	Minimum
WordPress	6.0
WooCommerce	8.0
PHP	8.0
Stripe account	Required for payments
Swft API key	Required — get one at swft.co.uk

What Swft does not change

• Product pages, cart page, account pages — untouched
• WooCommerce order management — all orders land in WP Admin as normal
• Existing payment gateways — Swft replaces checkout only; other gateways remain for orders placed outside Swft
• Coupons and discounts — calculated by WooCommerce, passed through in the session payload