# Discovery with Mateusz Szymkowicz

> Looking forward to our call. A few questions before we talk — so I can show up prepared and make the most of our time.

- Host: Mateusz Szymkowicz
- Duration: 40 min
- Location: Google Meet
- Host time zone: Europe/Warsaw
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/mateoworks/discovery
- Event type id: 823700

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=823700&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": 823700,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "businessname": "…",
    "project_type": "…",
    "primary_goal": "…",
    "budget_range": "…",
    "lead_source": "…",
    "website": "…",
    "address": "…",
    "start_timeline": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `businessname` (Business name), `project_type` (What service are you most interested in?), `primary_goal` (What's the main business goal behind this project?), `budget_range` (What's your current budget for this project?), `lead_source` (How did you hear about me?)
- Optional fields: `website` (Company website), `address` (Location), `start_timeline` (What's your timeline for getting started?), `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.