# Grow your hotel's revenue with One Horizyn

> A 30-minute call about your hotels: where they lose bookings and money today, and how OneHorizyn would grow their revenue. We agree what to set up, and a price that fits your group. There is nothing to prepare.

- Host: One Horizyn
- Duration: 30 min
- Location: Google Meet
- Host time zone: Asia/Calcutta
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/onehorizyn/book
- Event type id: 7431566

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7431566&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": 7431566,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "hotel": "…",
    "hotels": "…",
    "website": "…",
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Work email), `hotel` (Hotel or group name), `hotels` (How many hotels?)
- Optional fields: `website` (Hotel website), `attendeePhoneNumber` (Phone or WhatsApp), `notes` (Anything you'd like us to know?), `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.