# 25 Minutes with Björn W. Schäfer

- Host: Björn W. Schäfer
- Duration: 25 min
- Location: https://meet.google.com/ijw-wrmt-udg
- Host time zone: Europe/Brussels
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/bjoern/25
- Event type id: 197778

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=197778&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": 197778,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "Current-ARR-Range": "…",
    "Linkedin-Profile": "…",
    "How-did-you-find-me-": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What is this meeting about?), `Current-ARR-Range` (Current ARR-Range), `Linkedin-Profile` (Linkedin Profile), `How-did-you-find-me-` (How did you find me?)
- Optional fields: `guests` (Add guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.