A grep-based static auditor for Stripe integrations (open ruleset)

#stripe #python #security #webdev

The problem

Most Stripe integration bugs are not exotic. They are the same handful of patterns repeated across codebases: webhook handlers that never verify the signature, a secret key that got hardcoded during a quick test, a payment call retried without an idempotency key.

I built a small static analysis tool that greps a Python codebase for these patterns and flags them by severity, with the exact line and the rule it broke.

Example

Input file:

def webhook(request):
    event = json.loads(request.body)
    if event['type'] == 'payment_intent.succeeded':
        fulfill_order(event['data']['object'])

Auditor output:

[HIGH] webhook_signature_not_verified: line 2 - event parsed from raw body without stripe.Webhook.construct_event

No API keys, no network access to your Stripe account required: it only reads source files.

What it is, and what it is not

It is pattern-based static analysis: fast, zero dependencies, easy to drop into a pre-commit hook or CI step. It is not a full security audit and it does not suggest a fix for every finding, it tells you the rule, the line, and the severity so you can go straight to the relevant Stripe doc.

Ruleset covered

webhook signature verification
hardcoded live/test secret keys
missing idempotency key on create calls
legacy Charges/Sources API usage instead of PaymentIntents
client-supplied payment amount

Where to get it

Packed as a small CLI + rule file + PDF walkthrough, $29, instant download: https://buy.stripe.com/8x214m0WFeOudyzeVW7IY04

Happy to hear which pattern bit you in production - always looking to grow the ruleset.

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