# ConvertChat — Free Demo with Frank Nillard

> Turn your WhatsApp Business into a sales machine. I'll show you how to: send promotions to your entire contact list and let AI handle all the replies from your leads. In 20 minutes you'll see a live demo with your own business data. No commitment.

- Host: Frank Nillard
- Duration: 20 min
- Location: Google Meet
- Host time zone: Europe/Madrid
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/architct/demo-cchat-en
- Event type id: 6770775

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6770775&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": 6770775,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "url": "…",
    "email-or-wa": "…"
  }
}
```

- Required fields: `name` (Tu Nombre), `attendeePhoneNumber` (Your WhatsApp number (in case we need to contact you before the call)), `url` (Your Website (or LinkedIn profile URL)), `email-or-wa` (Do you have a list of clients with Email or WhatsApp)
- Optional fields: none
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.