# UndeContrac - Demo with Sergio Sanchez

> Thank you for scheduling a demo with us. I’m excited to show you what we’ve built and how it can help you structure, manage, and scale your real estate portfolio. Looking forward to our conversation. Sergio

- Host: Sergio Sanchez
- Duration: 15 min
- Location: Google Meet
- Host time zone: America/New_York
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/undercontrac/undecontrac-demo
- Event type id: 5464387

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5464387&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": 5464387,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "What-would-you-like-to-discuss-on-this-call": "…",
    "attendeePhoneNumber": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `What-would-you-like-to-discuss-on-this-call` (What would you like to discuss on this call?)
- Optional fields: `attendeePhoneNumber` (Phone number), `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.