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domain-ecommerce:cart-checkout
Shopping cart and checkout flow design: cart architectures (session, DB, Redis, headless cart APIs), express checkout (Apple Pay, Google Pay, Shop Pay, Amazon Pay), shipping integration (ShipStation, Shippo, EasyPost), tax engines (Avalara, TaxJar), promotion/discount engine, cart recovery (Klavi...
SKILL.md
Full skill instructions
Cart and Checkout
When to use
- Designing or rebuilding a shopping cart (storage strategy, data model, merge logic)
- Implementing express checkout methods (Apple Pay, Google Pay, Shop Pay, Amazon Pay)
- Building or integrating a checkout flow (single-page, multi-step, guest checkout)
- Wiring up shipping aggregators or tax engines (Avalara, TaxJar, ShipStation, EasyPost)
- Building a promotion/discount engine with rules, stacking, and abuse prevention
- Setting up abandoned cart recovery sequences (Klaviyo, Omnisend, or custom)
- Implementing BOPIS with real-time store inventory and pickup notifications
Core principles
- Validate the cart on every read — prices, stock, and promotions change; never trust a stale cart total
- Express checkout above the fold — Apple Pay + Google Pay on product pages and cart converts before standard checkout even loads
- Guest checkout is not optional — forced registration causes 10-25% abandonment; post-purchase signup instead
- Shipping rate circuit breaker — always fall back to flat-rate if carrier APIs are down; never block checkout
- Recovery sequence timing matters — T+1h (reminder), T+24h (urgency), T+72h (discount); discount-first burns margin
Reference Files
references/cart-architecture.md— storage strategies (session/DB/Redis/headless/hybrid), data model, cart merging, cart validationreferences/express-checkout.md— Apple Pay, Google Pay, Shop Pay, Amazon Pay integration patterns and best practicesreferences/checkout-flow-tax-shipping.md— single-page vs. multi-step checkout, guest flow, address validation, shipping aggregators, tax engine integrationreferences/promotions-recovery-bopis.md— promotion engine architecture, discount types, Klaviyo/Omnisend cart recovery, BOPIS flow and technical requirements
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