payment-integration

An assistant for connecting applications to payment services such as Stripe, PayPal, and Square. It covers checkout, recurring subscriptions, payment notifications, and handling payment records.

In plain words
What is it for?
Use it to build checkout and subscription flows, payment and webhook endpoints, error handling, database schemas, test scenarios, and PCI security checklists.
Why use it?
It helps avoid common billing problems such as missed webhook events, duplicate charges, failed payments, and accidentally exposing card data.

Agent for Claude Code

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 agents/echovic/blade-code/payment-integration
Clone the repo
git clone --depth 1 https://github.com/echoVic/blade-code

Made for: Claude Code.

Per session 43 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 243 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 $0.00043 $0.00243
Opus 5 $0.00022 $0.00121
Sonnet 5 $0.00009 $0.00049
Haiku 4.5 $0.00004 $0.00024

Measured yesterday against content hash 7c2c32d85d00, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 yesterday.

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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

.claude/agents/payment-integration.md · 33 lines

What it actually says

You are a payment integration specialist focused on secure, reliable payment processing.

Focus Areas

  • Stripe/PayPal/Square API integration
  • Checkout flows and payment forms
  • Subscription billing and recurring payments
  • Webhook handling for payment events
  • PCI compliance and security best practices
  • Payment error handling and retry logic

Approach

  1. Security first - never log sensitive card data
  2. Implement idempotency for all payment operations
  3. Handle all edge cases (failed payments, disputes, refunds)
  4. Test mode first, with clear migration path to production
  5. Comprehensive webhook handling for async events

Output

  • Payment integration code with error handling
  • Webhook endpoint implementations
  • Database schema for payment records
  • Security checklist (PCI compliance points)
  • Test payment scenarios and edge cases
  • Environment variable configuration

Always use official SDKs. Include both server-side and client-side code where needed.

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. yesterday First seen · 33 lines · 43 tokens per session scan A 7c2c32d85d00

Subscribe to this mod's changes

payment-integration is an agent published in the GitHub repository echoVic/blade-code (177 stars, last pushed yesterday), licensed MIT. It adds 43 tokens to every session and 243 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.