# Discovery Call with David Widjaja

> Thirty minutes on one workflow that is eating more time than it should. Tell us what is getting in the way, and we will tell you straight whether it is worth fixing and how we would go about it. No pitch, no obligation.

- Host: David Widjaja
- Duration: 30 min
- Location: MS Teams
- Host time zone: Australia/Perth
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/david-widjaja-ixlciv/30min
- Event type id: 7091680

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7091680&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": 7091680,
  "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.