Subscription Payment Engine FAQs

Question 1

Is the system secure for handling sensitive payment data?

Accepted Answer

Yes, it implements industry standards including AES-256 encryption for billing keys, webhook signature validation to prevent spoofing, and idempotency keys to prevent duplicate transactions.

Question 2

How does it handle subscription changes like upgrades or downgrades?

Accepted Answer

It implements a built-in proration (pro-rata) calculation utility that automatically adjusts billing amounts based on the remaining time in the current cycle.

Question 3

Can this skill adapt to different backend frameworks?

Accepted Answer

Absolutely. While it uses a reference architecture (Next.js/PostgreSQL), it contains a tech stack adaptation matrix to generate code for Spring Boot, NestJS, FastAPI, and various ORMs like JPA or Prisma.

Question 4

Does it include automated payment retries?

Accepted Answer

Yes, it includes a dedicated Dunning Manager that follows a 4-stage retry strategy for failed payments, complete with status tracking and notification hooks.

Question 5

What payment gateways are supported out of the box?

Accepted Answer

The skill includes pre-configured adapters for Toss Payments and KCP, but utilizes a PG-agnostic abstraction layer that allows for easy integration with Stripe, PayPal, or other providers.

Subscription Payment Engine

Key Features

Use Cases

Subscription Payment Engine

Key Features

Use Cases