payment-integration

Integrate Polar and Sepay payment gateways with webhook verification.

Updated Aug 23, 2026

Search Tags:#subscriptions #API integration #e-commerce #webhooks #checkout #payment gateway #Polar #Sepay

One-click install

npx skills add https://github.com/hanthienduc/myprotocol-stack --skill payment-integration-hanthienduc

Or copy as Structured Prompt for Agent▼

Please help me install this Agent Skill.
Skill: payment-integration
Source: https://github.com/hanthienduc/myprotocol-stack/tree/main/.claude/skills/payment-integration
Command: npx skills add https://github.com/hanthienduc/myprotocol-stack --skill payment-integration-hanthienduc

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires yargs, crypto, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

Integrating payment gateways into applications involves complex API interactions, webhook handling, and managing various payment flows (one-time, subscriptions). This skill provides comprehensive guidance and scripts for integrating popular payment providers like Polar and Sepay, streamlining the entire payment process.

Core Features & Use Cases

Gateway-Specific Integration: Detailed guides and SDK usage for Polar (checkouts, products, subscriptions, webhooks) and Sepay (API, QR codes, webhooks).
Secure Webhook Verification: Scripts to verify incoming webhooks from payment providers, ensuring data integrity and preventing fraud.
Subscription & Checkout Management: Best practices for implementing one-time payments, recurring subscriptions, and managing checkout flows.
Use Case: You need to add subscription billing to your SaaS application using Polar. Use this skill to understand Polar's SDK, implement secure checkout flows, and set up webhook verification to handle subscription events (e.g., renewals, cancellations) reliably.

Quick Start

Explain how to integrate Polar for subscription payments in a web application.