domain-ecommercepayment-integration

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Payment gateway integration patterns for e-commerce: Stripe, PayPal, Adyen, Square, Mollie, Razorpay, Checkout.com, BNPL (Klarna, Affirm, Afterpay), crypto payments (BitPay, BTCPay), payment orchestration (Primer, Spreedly), 3DS2 authentication, fraud prevention (Sift, Riskified), subscription billing, refunds/disputes, multi-currency, and idempotency.

rnavarych By rnavarych schedule Updated 3/3/2026
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name: domain-ecommerce:payment-integration description: | Payment gateway integration patterns for e-commerce: Stripe, PayPal, Adyen, Square, Mollie, Razorpay, Checkout.com, BNPL (Klarna, Affirm, Afterpay), crypto payments (BitPay, BTCPay), payment orchestration (Primer, Spreedly), 3DS2 authentication, fraud prevention (Sift, Riskified), subscription billing, refunds/disputes, multi-currency, and idempotency. allowed-tools: Read, Grep, Glob, Bash

Payment Integration

When to use

  • Integrating any payment gateway (Stripe, PayPal, Adyen, Square, Mollie, Razorpay, Checkout.com)
  • Adding BNPL options (Klarna, Affirm, Afterpay) or crypto payments (BitPay, BTCPay)
  • Building multi-PSP routing with orchestration layers (Primer, Spreedly)
  • Implementing 3DS2/SCA compliance for EU/UK payments
  • Setting up fraud prevention (Stripe Radar, Sift, Riskified, Signifyd)
  • Building subscription billing with dunning and lifecycle management
  • Handling refunds, chargebacks, multi-currency, and idempotency

Core principles

  1. Idempotency-Key on every payment request — network timeouts happen; without it you double-charge customers
  2. Never touch raw card data — tokenize client-side, send only tokens server-side; SAQ A or SAQ A-EP always
  3. Webhook handlers must be idempotent — deduplicate by event ID; Stripe retries; you will receive duplicates
  4. Liability shift via 3DS2 — pass browser + device data; frictionless approval rate rises dramatically with richer context
  5. Reconcile daily — gateway transactions vs. internal records; silent discrepancies become audits

Reference Files

  • references/gateway-integrations.md — Stripe (PaymentIntents, Connect, Billing), PayPal, Adyen, Square, Mollie, Razorpay, Checkout.com — integration patterns and key APIs
  • references/bnpl-crypto-orchestration.md — Klarna, Affirm, Afterpay integration; BitPay and BTCPay crypto; Primer and Spreedly orchestration strategy
  • references/fraud-security-reliability.md — 3DS2/SCA implementation, exemptions, fraud tools (Sift/Riskified/Signifyd), subscription lifecycle, refunds, chargebacks, multi-currency, idempotency
Install via CLI
npx skills add https://github.com/rnavarych/alpha-engineer --skill domain-ecommercepayment-integration
Repository Details
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