What problem does it solve? Ecommerce integrations fail in costly ways: double charges from missing idempotency keys, oversold inventory from race conditions, spoofed webhooks fulfilling unpaid orders, and PCI violations from card data touching application servers. This Skill provides a structured audit procedure to catch these defects before deployment. ## Core Features & Use Cases - Payment Integration Audit: Verifies Stripe, PayPal, and Adyen flows including PaymentIntent amounts, idempotency keys, webhook signature validation, and partial capture/refund handling. - Inventory & Order Integrity: Checks stock reservation patterns, atomic decrements, catalog sync retry logic, and order state machine transitions. - WordPress/WooCommerce Review: A merged reference covers nonces, capability checks, $wpdb->prepare usage, sanitization/escaping, and WooCommerce hook correctness. - Use Case: Before launching a WooCommerce store with a custom Stripe gateway, run this review to confirm webhook signature checks, idempotent order fulfillment, and absence of test credentials in production config. ## Quick Start Review this checkout and payment integration code for idempotency, webhook security, and inventory race conditions, then return a structured findings report.
