# Urgent call (15 min) with Marcel R. G. Berger

> For urgent cases only, for example • your app is down or crashing, • a store deadline is about to expire, or • a customer needs your answers to a security questionnaire at short notice. 15 minutes: you describe the situation, we agree on the next step. For everything else, please book the free initial call (30 min). You talk to Marcel directly. Free, no obligation. — The App Architect is a brand of DigitalFreedom Global LLC. Imprint · Privacy

- Host: Marcel R. G. Berger
- Duration: 15 min
- Location: MS Teams
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/marcelrgberger/urgent-call
- Event type id: 7375823

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7375823&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": 7375823,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "topic": "…",
    "company": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (your_name), `email` (Email address)
- Optional fields: `topic` (What is it about?), `company` (Company), `notes` (Anything I should know beforehand?), `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.