Ach Payments Duplicate Records Fix
ACH payment duplicate records in 2026 are almost always caused by webhook retries being processed more than once. When Stripe or Dwolla retries a webhook delivery (because your endpoint returned a non-2xx response), your handler processes the same event twice — creating a duplicate transaction record in your database.
Why This Happens
- Configuration gaps between tools or services
- Missing integrations or manual workarounds that weren't designed to scale
- Changes in vendor behavior, pricing, or API that weren't communicated clearly
What To Check First
- Verify your current setup matches the vendor's latest documentation
- Look for recent changes — platform updates, new team members, configuration drift
- Check if the problem is consistent or intermittent (different root causes, different fixes)
When To Escalate
- The problem is costing you money or customers per week
- You've spent more than 2 hours on it without progress
- A vendor quoted you more than $500 and you're not sure if it's necessary
Dealing with this right now?
The fix is idempotency: before processing any webhook event, check whether you have already processed that event ID. Store the event ID in your database with a unique constraint, and skip processing if it already exists. Stripe sends the same event ID on every retry — this pattern catches 100% of duplicate webhook issues. Also check for double-click prevention on your payment form: a form submitted twice in quick succession can also create duplicate records.
