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[docs] troubleshooting duplicate messages #3

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Oct 21, 2025
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[docs] troubleshooting duplicate messages #3

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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -136,6 +136,9 @@ The script expects webhook payloads from SMSGate in the following format:
- **Data not appearing**: Check that your webhook URL is correct and accessible
- **Authorization errors**: Re-deploy the web app with proper permissions
- **Column mismatch**: Verify your headers match exactly: "Timestamp", "From", "Message", "DeviceID", "MessageID"
- **Duplicate messages in sheet**: If you notice the same SMS message being logged multiple times, this occurs because Google Apps Script returns a 302 redirect for POST requests. SMSGate retries webhook delivery on non-2xx responses. To fix:
- Option 1: Set "Retry count" to 1 in SMSGate settings ([Settings → Webhooks → Retry count](https://docs.sms-gate.app/features/webhooks/#step-5-receive-the-payload))
- Option 2: Implement deduplication in your Apps Script using the unique `messageId` from the webhook payload

<p align="right"><a href="#readme-top">back to top</a></p>

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