You built your SaaS in a weekend with Cursor. The product works. Users are signing up. You integrate Stripe, submit for review, and get rejected. The rejection email is vague. Your vibe-coded app looks fine to you.

This happens constantly. Stripe’s security review catches issues that AI coding tools consistently miss. Understanding what they check helps you pass the first time.

What Stripe Actually Checks

Stripe doesn’t publish their complete checklist, but based on rejection patterns and their documentation, we know they evaluate:

Technical Security:

• HTTPS enforcement across all pages
• Secure authentication implementation
• Session management practices
• Cross-site scripting (XSS) protection
• Cross-site request forgery (CSRF) protection
• API key exposure

Business Compliance:

• Privacy policy presence
• Terms of service
• Refund policy clarity
• Contact information accessibility

Payment Flow:

• Proper use of Stripe Elements or Checkout
• Card data handling (never touching your servers)
• Error handling in payment flows

The 5 Most Common AI-Generated Failures

1. Exposed API Keys in Client Code

This is the most frequent rejection cause. AI models often generate code that includes API keys directly in frontend files.

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// AI-generated code that WILL get rejected
const stripe = require('stripe')('sk_live_xxxxx'); // Secret key in client!

// What Stripe expects
// Server-side only:
const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);

// Client-side:
const stripe = Stripe('pk_live_xxxxx'); // Publishable key only

Why AI does this: Training data includes tutorials that use keys directly for simplicity. The AI optimizes for “working code,” not “secure code.”

The fix: Move all secret key usage to server-side API routes. Verify your build output doesn’t contain sk_ strings.

2. Missing CSRF Protection

AI-generated forms rarely include CSRF tokens. Stripe checks for this because payment forms without CSRF protection can be exploited.

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// AI-generated payment form - no CSRF
<form action="/api/create-payment" method="POST">
  <input name="amount" value="1000" />
  <button>Pay</button>
</form>

// What Stripe expects
<form action="/api/create-payment" method="POST">
  <input type="hidden" name="_csrf" value={csrfToken} />
  <input name="amount" value="1000" />
  <button>Pay</button>
</form>

Why AI does this: Many tutorials skip CSRF for brevity. The AI learns that forms without CSRF “work.”

The fix: Implement CSRF tokens for all state-changing requests. Most frameworks have built-in support.

3. Insecure Session Handling

AI models generate session implementations that work but violate security best practices.

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// AI-generated session handling
res.cookie('session', userId, {
  httpOnly: false,  // Accessible to JavaScript
  secure: false,    // Works over HTTP
  sameSite: 'none'  // No CSRF protection
});

// What Stripe expects
res.cookie('session', signedSessionToken, {
  httpOnly: true,   // Not accessible to JavaScript
  secure: true,     // HTTPS only
  sameSite: 'strict', // CSRF protection
  maxAge: 3600000   // Reasonable expiration
});

Why AI does this: Development-friendly defaults (working over HTTP, accessible for debugging) appear frequently in training data.

The fix: Set httpOnly: true, secure: true, and sameSite: 'strict' on all session cookies.

4. Verbose Error Messages

AI-generated error handlers often expose internal details that help attackers.

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// AI-generated error handling
app.use((err, req, res, next) => {
  res.status(500).json({
    error: err.message,
    stack: err.stack,          // Exposes internal paths
    query: req.query,          // Reflects input
    database: err.sqlMessage   // Database details
  });
});

// What Stripe expects
app.use((err, req, res, next) => {
  logger.error(err); // Log internally
  res.status(500).json({
    error: 'An error occurred processing your request',
    requestId: req.id // For support lookup
  });
});

Why AI does this: Detailed errors are helpful during development. AI doesn’t distinguish between development and production patterns.

The fix: Log details server-side, return generic messages to clients, include request IDs for support.

5. Direct Card Data Handling

The most serious issue: AI sometimes generates code that handles card data directly instead of using Stripe’s secure elements.

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// AI-generated - NEVER DO THIS
<form onSubmit={handlePayment}>
  <input name="cardNumber" />  // You're now in PCI scope
  <input name="expiry" />
  <input name="cvc" />
</form>

const handlePayment = async (formData) => {
  // Sending card data to YOUR server = PCI compliance nightmare
  await fetch('/api/charge', { body: formData });
};

// What Stripe expects - use Elements
<Elements stripe={stripePromise}>
  <CardElement />  // Card data never touches your server
</Elements>

Why AI does this: Generic form patterns are common in training data. The AI doesn’t understand PCI compliance implications.

The fix: Always use Stripe Elements or Stripe Checkout. Card data should never touch your servers.

The Pre-Submission Checklist

Quick Validation Script

Run this against your deployment to catch common issues:

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# Check for exposed secret keys in built output
grep -r "sk_live\|sk_test" ./dist ./build ./.next 2>/dev/null

# Check for missing security headers
curl -I https://yoursite.com | grep -i "strict-transport\|x-frame\|x-content-type"

# Check for HTTPS redirect
curl -I http://yoursite.com 2>/dev/null | head -1
# Should show 301/302 redirect

# Check cookie settings (in browser console)
document.cookie  # Should return empty or minimal data

After Rejection: The Appeal Process

If Stripe rejects your application:

1. Read the rejection carefully. Stripe usually hints at the issue category.
2. Fix the identified issues. Don’t just address symptoms.
3. Document your fixes. Screenshots of security headers, code changes.
4. Resubmit with explanation. Briefly describe what you fixed.

Most rejections are resolved within one resubmission if you address the actual issues rather than surface symptoms.

FAQ

Conclusion

Getting rejected by Stripe feels frustrating when your app “works.” But their review process catches real vulnerabilities that would put your users at risk. The five fixes in this guide address the issues AI coding tools consistently miss.

Fix them once, and you won’t just pass Stripe’s review. You’ll have a more secure application for your users.