Stripe Webhooks Duplicate Records Fix
Stripe webhook duplicate records in 2026 are almost always caused by Stripe retrying a webhook after your endpoint successfully processed it but returned a non-2xx response (or timed out). Stripe does not know the processing succeeded — so it retries, and your handler runs the same logic again, creating a duplicate record.
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 at the event level: before any processing, check if you have already handled this event ID. Store the event ID in a database table with a unique constraint. If the insert fails (key already exists), return 200 immediately without processing. This prevents all duplicate-processing scenarios regardless of the retry reason. Also ensure your webhook handler returns 200 before doing any heavy processing — move the actual work to a background job, return 200 to Stripe immediately, then process async.
