Skills paypal-integration
💳

paypal-integration

Safe 🌐 Network access

Build PayPal checkout and subscriptions

You need a reliable PayPal payment flow that handles checkout, subscriptions, and refunds. This skill provides clear steps for API calls, IPN verification, and sandbox testing.

Supports: Claude Codex Code(CC)
📊 71 Adequate
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Test it

Using "paypal-integration". Provide a PayPal IPN verification checklist.

Expected outcome:

  • Receive POST data and preserve all fields
  • Add cmd=_notify-validate to the payload
  • POST back to the PayPal IPN endpoint
  • Accept only VERIFIED responses
  • Log and ignore duplicate transaction IDs

Using "paypal-integration". How do I create a subscription plan?

Expected outcome:

  • Create a product first via the Products API
  • Define a billing plan with pricing and cycle details
  • Activate the plan to make it available
  • Create a subscription using the plan ID
  • Redirect the subscriber to the approval URL

Using "paypal-integration". What are common PayPal checkout mistakes?

Expected outcome:

  • Trusting client callbacks without server verification
  • Processing IPN messages without checking for duplicates
  • Using sandbox credentials in production environment
  • Not handling all payment states (completed, refunded, charged back)
  • Hardcoding values instead of using configuration

Security Audit

Safe
v4 • 1/17/2026

Documentation-only skill providing PayPal integration guidance. All static findings are false positives: 'C2 keywords' refers to PayPal credential variables (client_id, client_secret); 'weak cryptographic algorithm' are scanner artifacts; 'Ruby/shell backtick execution' are markdown code block delimiters. Network URLs are legitimate PayPal API endpoints expected in payment documentation.

2
Files scanned
669
Lines analyzed
1
findings
4
Total audits

Risk Factors

🌐 Network access (3)
SKILL.md:59 SKILL.md:129 SKILL.md:229-231
Audited by: claude View Audit History →

Quality Score

38
Architecture
100
Maintainability
85
Content
30
Community
100
Security
91
Spec Compliance

What You Can Build

Add checkout flow

Map client button setup, server order creation, and capture verification.

Plan recurring billing

Define plan creation, subscription approval, and renewal handling.

Handle refunds and disputes

Document refund creation, chargeback handling, and status checks.

Try These Prompts

Quick start checklist 
Create a concise checklist for adding PayPal Smart Buttons and server side capture verification.
IPN verification steps 
Outline the IPN verification flow and idempotency checks for a Flask backend.
Subscriptions API flow 
List the API steps to create a product, plan, and subscription, and return the approval URL.
Refund workflow design 
Describe the server steps to issue a partial refund and retrieve refund details.

Best Practices

  • Verify IPN messages before processing any payment action
  • Use sandbox mode for all testing before production deployment
  • Make endpoints and credentials configurable via environment variables

Avoid

  • Trusting client callbacks without server verification
  • Processing IPN messages without idempotency checks
  • Mixing sandbox and production credentials

Frequently Asked Questions

Is this compatible with the PayPal REST API?
Yes. The guidance uses PayPal REST endpoints for checkout, subscriptions, and refunds.
What are the limits of this skill?
It provides guidance and patterns only. It does not run code or configure your PayPal account.
Can I integrate this with my existing backend?
Yes. The steps are framework agnostic and can be adapted to your stack.
Does it access or store my data?
No. It does not access files, credentials, or external systems.
What should I check if IPN verification fails?
Check endpoint URLs, required parameters, and network errors, then retry in sandbox.
How does this compare to PayPal SDKs?
It explains flows and patterns, while SDKs provide runnable client libraries.

Developer Details

Author

wshobson

License

MIT

Repository

https://github.com/wshobson/agents/tree/main/plugins/payment-processing/skills/paypal-integration

Ref

main

File structure

📄 SKILL.md