agentmods.dev

ck:payment-integration

A payment-integration guide covering checkout, subscriptions, webhooks, QR payments, software licences, and orders across SePay, Polar, Stripe, Paddle, and Creem.io. SePay supports Vietnamese bank transfers and VietQR, while the other providers target global payments, subscriptions, taxes, or licensing.

In plain words
What is it for?
Use it to add payment checkout, trials and upgrades, recurring billing, VietQR payments, webhook processing, device activation, revenue splits, or multi-provider order management.
Why use it?
It helps you choose a payment provider and plan the surrounding order and notification logic instead of treating each provider as an unrelated integration. It also covers webhook verification and duplicate-event handling.

Skill for Claude CodeCodex

88 4d ago A scan 48 tokens original MIT
View the source file manhvann/codexkit
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/manhvann/codexkit/payment-integration
Any agent
npx skills add manhvann/codexkit --skill payment-integration
Clone the repo
git clone --depth 1 https://github.com/manhvann/codexkit

Made for: Claude Code, Codex.

Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,084 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00048 $0.01084
Opus 5 $0.00024 $0.00542
Sonnet 5 $0.00010 $0.00217
Haiku 4.5 $0.00005 $0.00108

Measured 2d ago against content hash 9be3f281a6b0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ck:payment-integration scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/checkout-helper.js, scripts/polar-webhook-verify.js, scripts/sepay-webhook-verify.js, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/payment-integration/SKILL.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Payment Integration

Production-proven payment processing with SePay (Vietnamese banks), Polar (global SaaS), Stripe (global infrastructure), Paddle (MoR subscriptions), and Creem.io (MoR + licensing).

When to Use

  • Payment gateway integration (checkout, processing)
  • Subscription management (trials, upgrades, billing)
  • Webhook handling (notifications, idempotency)
  • QR code payments (VietQR, NAPAS)
  • Software licensing (device activation)
  • Multi-provider order management
  • Revenue splits and commissions

Platform Selection

Platform Best For
SePay Vietnamese market, VND, bank transfers, VietQR
Polar Global SaaS, subscriptions, automated benefits (GitHub/Discord)
Stripe Enterprise payments, Connect platforms, custom checkout
Paddle MoR subscriptions, global tax compliance, churn prevention
Creem.io MoR + licensing, revenue splits, no-code checkout

Quick Reference

SePay

  • references/sepay/overview.md - Auth, supported banks
  • references/sepay/api.md - Endpoints, transactions
  • references/sepay/webhooks.md - Setup, verification
  • references/sepay/sdk.md - Node.js, PHP, Laravel
  • references/sepay/qr-codes.md - VietQR generation
  • references/sepay/best-practices.md - Production patterns

Polar

  • references/polar/overview.md - Auth, MoR concept
  • references/polar/products.md - Pricing models
  • references/polar/checkouts.md - Checkout flows
  • references/polar/subscriptions.md - Lifecycle management
  • references/polar/webhooks.md - Event handling
  • references/polar/benefits.md - Automated delivery
  • references/polar/sdk.md - Multi-language SDKs
  • references/polar/best-practices.md - Production patterns

Stripe

  • references/stripe/stripe-best-practices.md - Integration design
  • references/stripe/stripe-sdks.md - Server SDKs
  • references/stripe/stripe-js.md - Payment Element
  • references/stripe/stripe-cli.md - Local testing
  • references/stripe/stripe-upgrade.md - Version upgrades
  • External: https://docs.stripe.com/llms.txt

Read the full file on GitHub · 104 lines

Files

What ships with it

42 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 104 lines · 48 tokens per session scan A 9be3f281a6b0

Subscribe to this mod's changes

ck:payment-integration is a skill published in the GitHub repository manhvann/codexkit (88 stars, last pushed 4d ago), licensed MIT. It adds 48 tokens to every session and 1,084 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

E-commerce
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