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Found 51 Skills
Best practices for webhook handlers. Use when implementing the handler sequence (verify first, parse second, handle idempotently), idempotency, error handling, retry logic, or framework-specific issues with Express, Next.js, or FastAPI.
External API integration and webhook handling including HTTP endpoint routing, request/response handling, authentication, CORS configuration, and webhook signature validation
Get paid from day one. Payments, subscriptions, billing portal, webhooks, metered billing, Stripe Connect. The complete guide to implementing Stripe correctly, including all the edge cases that will bite you at 3am. This isn't just API calls - it's the full payment system: handling failures, managing subscriptions, dealing with dunning, and keeping revenue flowing. Use when: stripe, payments, subscription, billing, checkout.
Complete Stripe payments integration with subscriptions, webhooks, and customer portal. Use when adding billing to a SaaS application with subscription tiers, usage-based pricing, or one-time payments.
Guides development and debugging of Fynd extensions using the FDK (Fynd Development Kit). Covers backend layout (Express, platform/partner/basic routes), webhooks, company-scoped config, and common patterns for catalog, custom, and platform-scoped extensions. Use when working on any Fynd extension, FDK, Fynd Platform APIs, partner panel, or extension webhooks.
Use when adding payments, billing, checkout, subscriptions, invoices, webhooks, customer portal, Stripe Connect, metered/usage billing, tax, fraud/Radar, pricing page, payment intents, refunds, coupons, promo codes, or any Stripe integration in Next.js. Triggers: stripe, payment, checkout, subscribe, billing, invoice, webhook, portal, connect, marketplace, payout, metered, usage-based, SaaS pricing, paywall, plan, tier.
Stripe payments integration guidance — native Vercel Marketplace setup, checkout sessions, webhook handling, subscription billing, and the Stripe SDK. Use when implementing payments, subscriptions, or processing transactions.
Universal Saleor app development patterns. Covers the app protocol (manifest, registration, webhooks, authentication), SDK abstractions, settings persistence, and Dashboard integration. Framework-agnostic with Next.js examples.
Complete subscription billing system with Stripe integration, feature flags for plan gating, webhook handling, and billing portal.
Implement payment integrations with SePay (Vietnamese payment gateway with VietQR, bank transfers, cards) and Polar (global SaaS monetization platform with subscriptions, usage-based billing, automated benefits). Use when integrating payment processing, implementing checkout flows, managing subscriptions, handling webhooks, processing bank transfers, generating QR codes, automating benefit delivery, or building billing systems. Supports authentication (API keys, OAuth2), product management, customer portals, tax compliance (Polar as MoR), and comprehensive SDK integrations (Node.js, PHP, Python, Go, Laravel, Next.js).
Validate n8n expression syntax and fix common errors. Use when writing n8n expressions, using {{}} syntax, accessing $json/$node variables, troubleshooting expression errors, or working with webhook data in workflows.
Complete API integration guide for Shopify including GraphQL Admin API, REST Admin API, Storefront API, Ajax API, OAuth authentication, rate limiting, and webhooks. Use when making API calls to Shopify, authenticating apps, fetching product/order/customer data programmatically, implementing cart operations, handling webhooks, or working with API version 2025-10. Requires fetch or axios for JavaScript implementations.