# 30 Minute Call with Karn Wong

> We can talk about anything for half an hour. คุยอะไรกันก็ได้ภายในครึ่งชั่วโมง If you can't make it, please cancel the meeting or drop me an email. I'll stay on the call for 5 minutes in case you're running late. ถ้าติดนัดหรือไม่สะดวกอาจจะขอรบกวนให้กด cancel หรือส่งเมล์มาบอก เลทได้ไม่เป็นไร แต่อาจจะขอออกก่อนถ้า 5 นาทีแล้วยังไม่มา

- Host: Karn Wong
- Duration: 30 min
- Location: Google Meet
- Host time zone: Asia/Bangkok
- Confirmation: The host confirms each booking; it stays pending until they accept it.
- Booking page: https://cal.com/karn-wong-uuhbtm/30-minute-call
- Event type id: 3042276

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3042276&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": 3042276,
  "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.
- A successful response is a pending booking request.