Skill

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 (Klaviyo, Omnisend), BOPIS (buy online pick up in-store), guest checkout, address validation, and checkout conversion optimization.

Install

npx claudepluginhub rnavarych/alpha-engineer --plugin domain-ecommerce

Tool Access

This skill is limited to using the following tools:

ReadGrepGlobBash

Preview

- Designing or rebuilding a shopping cart (storage strategy, data model, merge logic)

Supporting Assets

references/cart-architecture.mdreferences/checkout-flow-tax-shipping.mdreferences/express-checkout.mdreferences/promotions-recovery-bopis.md

SKILL.md

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Stats

Parent Repo Stars9

Parent Repo Forks0

Last CommitMar 3, 2026

Actions

View Source View Plugin View on GitHub View README

domain-ecommerce:cart-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 validation

references/express-checkout.md — Apple Pay, Google Pay, Shop Pay, Amazon Pay integration patterns and best practices

references/checkout-flow-tax-shipping.md — single-page vs. multi-step checkout, guest flow, address validation, shipping aggregators, tax engine integration

references/promotions-recovery-bopis.md — promotion engine architecture, discount types, Klaviyo/Omnisend cart recovery, BOPIS flow and technical requirements

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 validation
references/express-checkout.md — Apple Pay, Google Pay, Shop Pay, Amazon Pay integration patterns and best practices
references/checkout-flow-tax-shipping.md — single-page vs. multi-step checkout, guest flow, address validation, shipping aggregators, tax engine integration
references/promotions-recovery-bopis.md — promotion engine architecture, discount types, Klaviyo/Omnisend cart recovery, BOPIS flow and technical requirements