ERR_WEBHOOK_FAILED on Pipedrive: Webhook Delivery Status: Failed / Paused. Root cause: Pipedrive webhook delivery failed due to endpoint unreachable, timeout, invalid response, or subscription issue. Common causes: webhook endpoint down or misconfigured, network timeout (default 30 seconds), endpoint returns non-2xx status, webhook subscription deleted or disabled, IP whitelist blocking webhook delivery. Step 1: Establish a Receiver Queue. Do not perform heavy business or database logic directly inside the script block that accepts the webhook. Step 2: Issue Immediate 200 OK. Program your endpoint script to instantly store the incoming data payload in a temporary memory buffer or queue system and instantly reply with a blank HTTP 200 OK status back to Pipedrive within 500 milliseconds. Step 3: Process Asynchronously. Use a separate, decoupled background process to pick up the payload from the queue and execute the CRM sync logic without hanging the connection.