Skill UI

Execute comprehensive load, stress, and soak tests to validate API performance, identify scaling bottlenecks, and establish throughput baselines. This tool simulates realistic, high-volume traffic patterns using industry-standard tools like k6 or Artillery, allowing users to define complex scenarios (e.g., e-commerce checkout flows, traffic spikes) and assert performance thresholds (p95 latency, error rates). It helps pinpoint resource limitations in databases, network layers, or compute resources, ensuring the API is ready for production scalability.

This skill provides expert guidance on integrating major payment processors like Stripe and PayPal. It covers end-to-end checkout flows, subscription billing, secure webhook handling, and strict PCI compliance requirements. Use this when building any feature involving financial transactions to ensure reliability and adherence to security best practices.

A comprehensive guide to integrating PayPal into applications, covering all aspects of the payment lifecycle. This skill covers client-side implementations using JavaScript SDK for Express Checkout, server-side API interactions (REST API) for order creation and capture, handling recurring billing via Subscriptions, managing asynchronous updates through IPN/Webhooks, and processing refunds and payouts. Ideal for building robust e-commerce payment gateways.

This comprehensive guide covers the full stack of Shopify development. Learn to build robust custom applications, highly customized extensions (for checkout, admin, and POS), and dynamic storefront themes. It details using GraphQL Admin API, managing webhooks, and utilizing Liquid for templating, enabling developers to integrate external services and enhance the entire merchant e-commerce experience.

Provides concise guidance for implementing Stripe integrations, prioritizing CheckoutSessions, PaymentIntents, Billing and Connect flows, avoiding deprecated endpoints, and following migration and compliance recommendations.

This comprehensive guide covers implementing production-grade billing systems using Stripe. It details features like subscriptions with trials and proration, usage-based billing, checkout session management, idempotent webhook handling, and customer portal integration. Applicable for Next.js, Express, and Django environments, making it ideal for setting up or debugging complex payment workflows.

This skill implements robust supply chain integrity verification for container builds using the in-toto framework. It establishes a verifiable record by generating cryptographically signed link metadata at every stage (checkout, build, scan). This allows users to prove that deployed container images followed an approved process, with enforcement mechanisms integrated for Kubernetes admission control.

A comprehensive guide for manually assessing critical business rules and workflows in web applications. This technique goes beyond automated scanning by simulating attacks like price manipulation, multi-step process bypass, and privilege escalation. Ideal for securing e-commerce checkout funnels, financial transactions, and complex authorization systems.

Leverage AI-powered exploratory testing to thoroughly audit web applications and verify functionality. This skill simulates user interaction, detecting complex bugs, validating critical flows (like checkout or login), and checking accessibility compliance. Use it proactively after development to ensure quality before deployment.

These extensions enable developers to customize the Shopify checkout experience using sandboxed, React-like components. They serve as the modern replacement for the deprecated checkout.liquid, allowing deep integration into the purchase flow. Use cases include adding custom data fields (metafields), rendering dynamic promotional banners, and reading real-time checkout state information.

Learn how to build advanced, server-side business logic for Shopify using Shopify Functions and WebAssembly (WASM). This guide covers implementing custom discount rules, payment customizations, delivery option filtering, and cart transformations directly at the checkout. Designed for developers, it leverages the WASM sandbox for highly constrained, powerful e-commerce functionality.

This guide details how to build modern, custom headless storefronts using Shopify's Storefront API and Cart API. It covers key functionalities like product querying, cart management (adding/updating lines), and initiating the checkout flow. Designed for developers building client-facing e-commerce experiences, it emphasizes the use of public access tokens for decoupled, highly customizable online stores.