{"product_id":"vapi-voice-agent-google-calendar-appointment-webhooks-n8n","title":"Vapi Voice Agent + Google Calendar Appointment Webhooks (n8n)","description":"\u003ch3\u003eAutomatically route Vapi voice calls to Google Calendar bookings—through secure webhooks in n8n\u003c\/h3\u003e\n\u003cp\u003eThis n8n workflow powers a \u003cstrong\u003eVapi Voice Agent\u003c\/strong\u003e with two webhook endpoints that \u003cstrong\u003echeck availability\u003c\/strong\u003e and \u003cstrong\u003ebook appointments\u003c\/strong\u003e in \u003cstrong\u003eGoogle Calendar\u003c\/strong\u003e. It validates requests using a \u003cstrong\u003eshared secret\u003c\/strong\u003e, enforces \u003cstrong\u003eopening days\/hours\u003c\/strong\u003e and \u003cstrong\u003eminimum notice\u003c\/strong\u003e, and returns structured tool results Vapi can use during the call.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExposes two webhook endpoints\u003c\/strong\u003e for Vapi tool calls: \u003ccode\u003echeck_availability\u003c\/code\u003e and \u003ccode\u003ebook_appointment\u003c\/code\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValidates security\u003c\/strong\u003e by checking a shared \u003cstrong\u003ewebhookSecret\u003c\/strong\u003e from the request headers and parsing the incoming tool payload into a normalized request format.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChecks availability\u003c\/strong\u003e by querying Google Calendar \u003cstrong\u003efree\/busy\u003c\/strong\u003e across a configurable search window and returning whether the slot is available (plus nearest alternatives).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValidates booking requests\u003c\/strong\u003e by verifying required customer details and ensuring the requested time fits configured \u003cstrong\u003eopening days\/hours\u003c\/strong\u003e and \u003cstrong\u003eminimum notice rules\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRe-checks free\/busy\u003c\/strong\u003e for the exact requested slot immediately before booking to prevent race conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCreates a Google Calendar event\u003c\/strong\u003e with your configured title and includes the caller’s details in the event description.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResponds to Vapi\u003c\/strong\u003e with a structured tool-result response (e.g., \u003ccode\u003estatus: ok\u003c\/code\u003e) or a clear error code.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eLet callers book meetings via voice and have confirmations reflected instantly in \u003cstrong\u003eGoogle Calendar\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eOffer “next available times” during a call when requested slots are unavailable.\u003c\/li\u003e\n  \u003cli\u003eEnsure bookings respect your operational schedule (opening hours + notice period) without manual coordination.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGoogle Calendar integration\u003c\/strong\u003e: OAuth2 credential used for free\/busy lookup and event creation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003en8n nodes used\u003c\/strong\u003e: \u003ccode\u003ewebhook\u003c\/code\u003e, \u003ccode\u003eif\u003c\/code\u003e, \u003ccode\u003eset\u003c\/code\u003e, \u003ccode\u003ecode\u003c\/code\u003e, \u003ccode\u003eswitch\u003c\/code\u003e, and \u003ccode\u003esticky note\u003c\/code\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSetup highlights\u003c\/strong\u003e: configure \u003ccode\u003ewebhookSecret\u003c\/code\u003e, confirm the \u003ccode\u003esecretHeader\u003c\/code\u003e name, set \u003ccode\u003ecalendarId\u003c\/code\u003e and timezone, then define opening days\/hours and appointment length.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":46217920938163,"sku":"N8N-20820","price":67.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/o2JTmDYM3w2lqotkOrVqg_j1lilB6Z.png?v=1791883277","url":"https:\/\/buyflowscripts.com\/products\/vapi-voice-agent-google-calendar-appointment-webhooks-n8n","provider":"N8N Commerce","version":"1.0","type":"link"}