# Erstgespräch with Ronald Blüthl

> 30 Minuten, in denen Sie uns erzählen, woran Sie arbeiten, oder wo es hakt. Keine Vorbereitung, keine Unterlagen nötig. Sie sprechen direkt mit einem Entwickler, nicht mit dem Vertrieb. Am Ende wissen Sie, ob und wie wir helfen können.

- Host: Ronald Blüthl
- Duration: 30 min
- Location: Attendee phone number
- Host time zone: Europe/Vienna
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/rbluethl/erstgespraech
- Event type id: 6004466

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6004466&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": 6004466,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "location": {
    "type": "attendeePhone",
    "phone": "…"
  },
  "bookingFieldsResponses": {
    "title": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `title` (What is this meeting about?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.
- `location` is required: `location.phone` is the attendee’s own.