# Free 15-min Intro with Luca Vavassori

> We'll walk through your revenue flow and identify exactly where your system breaks. You'll leave knowing whether this is an architecture problem we can fix, or something better solved elsewhere. No pitch either way. By scheduling, you accept that this call is recorded for reference.

- Host: Luca Vavassori
- Duration: 15 min
- Location: Cal Video
- Host time zone: America/New_York
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/luca-therunbook/free-15-min-intro
- Event type id: 5546065

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5546065&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": 5546065,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- 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.