model: { provider: 'openai', model: 'gpt-4o', messages: [ { role: 'system', content: "You are a helpful assistant. Keep your responses concise and conversational. You're speaking to someone through voice, so avoid using formatting or special characters.", }, ], }, server: { url: 'https://api.xxx.com/webhook/vapi', secret: 'bac5fdb0-..........................', // 👈 Must match what your server checks timeoutSeconds: 20, }, webhook endpoint never recent event any suggestion?