# Free 15-minute call with Lars Hofmann · Cedarpost Systems

> A free 15-minute call to talk about your business. Ask about the AI audit and our other services, a project you have in mind, or anything else. You’ll get a straight answer on whether AI can help.

- Host: Lars Hofmann · Cedarpost Systems
- Duration: 15 min
- Location: Google Meet, Attendee phone number
- Host time zone: America/Vancouver
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/cedarpost/call
- Event type id: 7532489

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7532489&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

```http
POST https://api.cal.com/v2/bookings
cal-api-version: 2026-02-25
Content-Type: application/json

{
  "eventTypeId": 7532489,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "Business-Name": "…",
    "What-do-you-want-to-talk-about": "…",
    "attendeePhoneNumber": "…",
    "What-does-your-business-do": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `Business-Name` (Business Name), `What-do-you-want-to-talk-about` (What do you want to talk about?)
- Optional fields: `attendeePhoneNumber` (Phone number), `guests` (Add guests), `What-does-your-business-do` (What does your business do?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.
- `location` is optional; without it the booking uses the event’s first location.