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Checkout & Revenue Leak Monitoring

Silent checkout bugs are costing you money. Here's how to catch them before customers do.

The Problem

Merchants discover checkout bugs via customer complaints, not monitoring. Common issues:

  • Safari/iOS payment buttons not working
  • Promo codes breaking silently
  • Shipping calculators failing
  • Mobile checkout flow interruptions
  • Payment processor edge cases

You know you're losing money, but you can't see it happening.

Symptom → Cause → Fix

Safari iOS payment button not working

Causes:

  • Apple Pay button conflicts with custom checkout
  • Third-party scripts blocking payment forms
  • CSS z-index issues on mobile Safari

Fix:

  1. Test on real iOS devices (not just simulators)
  2. Check browser console for JavaScript errors
  3. Disable third-party scripts one by one
  4. Verify payment processor SDK compatibility

Promo code not applying

Causes:

  • Cart total calculation errors
  • Discount app conflicts
  • Expired or invalid code logic
  • Minimum order value not met

Fix:

  1. Test all active promo codes weekly
  2. Check discount app logs for conflicts
  3. Verify cart total calculations
  4. Set up automated promo code testing

Prevention Checklist

  • ☐Weekly synthetic checkout tests on all payment methods
  • ☐Monitor checkout abandonment rates by device/browser
  • ☐Test promo codes before major campaigns
  • ☐Set up alerts for checkout error spikes
  • ☐Regular regression testing after app updates
  • ☐Monitor payment processor webhook failures

Quick Wins

Set up basic monitoring

Use tools like Hotjar or Microsoft Clarity to track checkout funnel drop-offs. Free tier is enough to catch major issues.

Test on real devices

Don't rely on browser dev tools. Test checkout on actual iOS/Android devices weekly.

Automate promo code testing

Create a simple script that tests all active promo codes daily. Catch issues before customers do.

Last updated: December 14, 2025

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