Does this skill handle mid-cycle plan changes?

Yes, it includes a dedicated proration utility that calculates proportional billing and credits when a user upgrades or downgrades their plan mid-cycle.

How does it ensure payment security?

The module implements AES-256 encryption for billing keys, HMAC signature verification for webhooks, and follows PCI DSS principles for sensitive data handling.

Which payment gateways (PG) are supported?

The module comes with built-in adapters for Toss Payments and KCP, but features a PG-agnostic abstraction layer that makes it easy to add others like Stripe or NHN KCP.

Is it compatible with frameworks other than Next.js?

While the reference implementation is Next.js, the skill includes a technology adaptation matrix to map the logic to Spring Boot, NestJS, FastAPI, and various ORMs like JPA or Prisma.

Automated Subscription Payment Module

Name: Automated Subscription Payment Module
Author: ASTRA-TECHNOLOGY-COMPANY-LIMITED

byASTRA-TECHNOLOGY-COMPANY-LIMITED

0•

E-commerce Solutions

Builds and integrates end-to-end subscription billing systems with multi-PG support, invoicing, and credit management.

This skill automates the entire pipeline for developing complex subscription-based billing systems. Based on the ASTRA methodology, it handles everything from database schema generation (13+ tables) and API implementation to frontend dashboard creation. It supports robust features including plan management, billing key encryption (AES-256), subscription lifecycles with proration, automated invoicing, PG-agnostic adapters (Toss Payments, KCP), and sophisticated Dunning strategies for failed payments. It is ideal for SaaS developers looking to implement production-ready billing infrastructure without manual boilerplate.

Key Features

01PG-Agnostic architecture with pre-built Toss Payments and KCP adapters

020 GitHub stars

03End-to-end subscription lifecycle (Start, Change, Cancel, Pause, Resume)

04Secure infrastructure with AES-256 encryption and webhook signature verification

05Complex billing logic including proration, dunning cycles, and credit management

06Comprehensive UI components for pricing tables, payment methods, and admin dashboards

Use Cases

01Bootstrapping a full SaaS subscription system from a design blueprint

02Integrating secure South Korean Payment Gateways (PG) into a global framework

03Implementing usage-based credit systems and automated recurring billing

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add astra-technology-company-limited/astra-methodology payment-module

For use in Claude.ai and ChatGPT

Key Features

01PG-Agnostic architecture with pre-built Toss Payments and KCP adapters

020 GitHub stars

03End-to-end subscription lifecycle (Start, Change, Cancel, Pause, Resume)

04Secure infrastructure with AES-256 encryption and webhook signature verification

05Complex billing logic including proration, dunning cycles, and credit management

06Comprehensive UI components for pricing tables, payment methods, and admin dashboards

Use Cases

01Bootstrapping a full SaaS subscription system from a design blueprint

02Integrating secure South Korean Payment Gateways (PG) into a global framework

03Implementing usage-based credit systems and automated recurring billing

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add astra-technology-company-limited/astra-methodology payment-module

For use in Claude.ai and ChatGPT