# 45 Min AI / Marketing consultation with Christian Förster

> The consultation costs 100 € (plus VAT for Polish companies and private individuals). I will send you a PayPal payment request to the email address you provide in one of the following steps. The payment must be received at least one day before the consultation date. Otherwise, the appointment will be cancelled.

- Host: Christian Förster
- Duration: 45 min
- Location: Google Meet
- Host time zone: Europe/Warsaw
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/christianfoerster/30min
- Event type id: 3086209

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3086209&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": 3086209,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What is this meeting about?)
- Optional fields: `notes` (Additional notes), `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.