# Erstgespräch with Julian Lenk

> Buche Dir hier Deinen Beratungsgespräch. Max. 7 Werktage in die Zukunft buchbar.

- Host: Julian Lenk
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/julian-lenk/erstgespraech
- Event type id: 3729318

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3729318&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": 3729318,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "Grund": "…",
    "Wann": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Deine E-Mail Adresse), `Grund` (Was möchtest Du besprechen?), `Wann` (Wann möchtest Du beginnen?)
- Optional fields: `notes` (Was möchtest Du noch los werden?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.