Payment Gateway Abstraction Guard

The problem

LLMs and developers often hardcode provider-specific SDKs directly into checkout routes and webhook handlers. This creates massive technical debt when you need to add a second provider, support regional gateways, or switch away from Stripe.

What it does

• Enforces a strict adapter pattern where all business logic interacts with a unified PaymentService interface.
• Isolates provider-specific SDKs and API logic into dedicated adapter classes.
• Implements a factory pattern to resolve the active gateway at runtime based on configuration rather than hardcoded imports.
• Standardizes webhook verification and subscription status management across different payment APIs.
• Provides a blueprint for a mock adapter to enable local development without live credentials.

Frameworks & tools

Works with any TypeScript or JavaScript stack using Node.js, Next.js, or Express. Compatible with Stripe, Braintree, PayPal, Razorpay, and regional providers.

Why this beats prompting it yourself

Standard prompts result in one-off Stripe integrations that scatter SDK calls throughout your codebase. This skill ensures your billing architecture is vendor-agnostic from the first line of code, preventing the "unspooling" process required when scaling to new markets.

Use cases

• Architecting a multi-tenant SaaS that allows customers to use their own gateway keys.
• Expanding a platform into regions where Stripe is unsupported or has high fees.
• Testing end-to-end checkout flows locally using a mock payment adapter.
• Refactoring legacy billing code to support crypto or alternative payment methods.

Known limitations

Requires an existing configuration or admin settings layer to store and retrieve gateway credentials at runtime.