Google Calendar booking API: a template with a Telegram alert

The Google Calendar booking API template in nana800 works like this: your site sends a title and time to a webhook, the calendar block creates an event, the bot alerts you in Telegram, and the site gets the event ID back. No server or code is needed, and you connect Google with a button in the block. One booking costs four basic block runs, and your balance is topped up to $3.50 for free every month.

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The Google Calendar booking API with a Telegram alert template scheme in the nana800 builder

Chain of blocks

  1. 1

    Trigger

    button starts the scheme by hand for a test. The event fields take their data from the request, so put test values into them before a button test, or test the scheme on the API page.

  2. 2

    Trigger · Webhook (trigger)

    webhook is the address your site, booking form or CRM sends JSON to, with the fields title, description, start_time and end_time.

  3. 3

    Action · Create a Google Calendar event

    Google Calendar Event book creates an event in the main calendar of the connected Google account, with the title, description, start and end from the request. By default it is a meeting with a Google Meet call and a 5 minute reminder.

  4. 4

    Action · Send Telegram message

    Telegram message send sends you a "New booking!" message with the title, start and end of the booking. You add the bot token and chat ID.

  5. 5

    Action · Webhook response

    webhook response answers the sender with code 200 and JSON with success, a success message and the event_id of the event.

What it is good for

  • A booking for a consultation or a trial lesson on your site goes straight into the calendar
  • Time slots with a stylist, tutor or specialist, with an alert in Telegram
  • Meetings from a chatbot or a CRM: any service that can send a request to an address puts an event in the calendar
  • A Google Meet call for every booking, with the link returned to the site in the answer
  • An invitation from Google for the client: their email comes in the request and goes into the guests field

How to set it up

  1. 1

    Open the template

    In the builder open Templates, find Google Calendar Booking API and press Use. A scheme with five connected blocks appears in the project you pick.

  2. 2

    Set up the webhook

    A webhook is the address your site sends booking data to. In the webhook block set method to POST: the template has GET, but the data comes in the request body. In path enter a path that starts with "/", for example /booking.

  3. 3

    Connect Google Calendar

    In the Google Calendar Event book block press the connect button and sign in to your Google account: events will appear in its main calendar. Keep the MEETING event type for a meeting with a Google Meet call, or pick RECORD for a plain event. Check the time zone.

  4. 4

    Add a Telegram bot

    In the Telegram message send block paste the bot token from @BotFather and the chat ID, @getmyid_bot shows yours. Press Start in your bot, otherwise it cannot message you. You can rewrite the alert text as you like.

  5. 5

    Turn the scheme on and send a test booking

    Turn the scheme on: while it is off, the webhook answers with code 409. Press the API button in the builder and on the Try it tab send JSON like {"title": "Haircut, Anna", "start_time": "2026-11-20T15:00:00+03:00", "end_time": "2026-11-20T16:00:00+03:00", "description": "Client phone"}. The event really appears in the calendar.

  6. 6

    Connect your site form

    Copy the webhook address on the API page and paste it into your booking form or any service that can send requests. Send all four fields: if one is missing, the word undefined appears in its place in the event and the message. An enabled scheme costs $0.0042 per hour.

Services in this template

  • Webhook

    Receive website leads and service events with a webhook and answer requests with no server and no code. Free balance every month, no card needed.

  • Google Calendar

    Create Google Calendar events and Google Meet calls without code: a website booking turns into an event with invitations for guests. Free balance every month.

  • Telegram

    Build a Telegram bot without code: reply to messages, add buttons, send leads and alerts to a chat, group or channel. Free balance every month, no card needed.

Frequently asked questions

One booking costs four basic block runs: the webhook and the Telegram message count as one each, the calendar event as two, and the answer to the site is free. 1,000 basic runs cost $1. An enabled scheme costs $0.0042 per hour. Your balance is topped up to $3.50 for free every month with no card, but a scheme kept on around the clock spends most of that on scheme hours.

In the template the Telegram alert and the answer to the site go out after the calendar block anyway, even if Google returned an error. To avoid that, put a condition block after the calendar block: check that success_sent is true, and on an error return the reason from error_text to the site. A failed attempt is not charged.

No, the block creates an event at the time it receives and does not look at calendar availability. Your form or booking service should show free slots to the client, and the template puts the chosen time into the calendar and tells you about it.

In ISO format with a time zone, for example 2026-11-20T15:00:00+03:00: such a time is taken as exact. Without a zone in the value, the block uses the zone from its time zone field, Moscow by default. The end must be later than the start.

For the MEETING type Google creates the call itself, and the block returns its link in the meet_link field. Add it to the answer in the webhook response block so the site shows it to the client right away, or put it into a message. The html_link field holds the link to the event itself.

Only if their email is in the guests field of the calendar block. In the template that field is empty: send the client email in the request and put it into the field from the webhook. Then Google emails the client an invitation itself.

Build your first scheme for free

Sign-up is free and needs no card. Every month the balance is topped up to $3.50 for free, enough for about 3,500 runs of basic blocks.

Build it in the builder