ERR_PD_WEBHOOK on Pipedrive: Pipedrive Webhook Events Stop Delivering After Integration Update. Root cause: Pipedrive webhook delivery stopped after update due to endpoint failure, subscription disabled, or delivery retry limit exceeded. Common causes: webhook endpoint down after Pipedrive update, endpoint returning non-2xx status, webhook subscription manually disabled, failed delivery retry limit (5 retries over 24 hours) exceeded, IP whitelist blocking webhook. Step 1: Check Webhook Status in Pipedrive. In Pipedrive, go to Settings > Tools and Apps > Webhooks. Check the status column for your webhook. If it shows "Inactive" or "Disabled", it has been automatically paused due to delivery failures. Step 2: Verify the Receiving Endpoint. Test your webhook receiving URL directly using curl or Postman. Confirm it returns HTTP 200 within 10 seconds. Check SSL certificate validity — Pipedrive requires a valid, non-expired SSL certificate on the receiving endpoint. Step 3: Re-enable and Test the Webhook. Delete the disabled webhook and create a new one with the correct URL. Use Pipedrive's built-in "Send test" feature to confirm delivery before going live. Set up monitoring on your receiving endpoint to alert on 5xx errors before Pipedrive disables the webhook again.