# Leistungssteigerung Stufe 1 with Fastlane Tuning Schweiz GmbH

> Anpassung der Leistungsstufen eines Fahrzeugs an Stufe 1, nur Software oder tuning box installieren

- Host: Fastlane Tuning Schweiz GmbH
- Duration: 240 min
- Location: Einheit 121, Green Places, Sudstrasse 16, 3110 Munsingen
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/fastlane/leistungssteigerung
- Event type id: 406723

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=406723&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": 406723,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "bei-Problemen-oder-Termin-nderungen-in-letzter-Minute": "…",
    "Marke-und-Modell": "…",
    "Baujahr-und-Leistung": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `bei-Problemen-oder-Termin-nderungen-in-letzter-Minute` (Handy Nummer), `Marke-und-Modell` (Marke und Modell), `Baujahr-und-Leistung` (Baujahr und Leistung)
- Optional fields: `notes` (Additional notes)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.