# Follow-up consultation with Derrick Soh

> A check-in for returning clients. We look at how things have gone since your last session and adjust as needed, covering herbs, food, and acupressure you apply yourself. You receive an updated written summary afterwards. If a tongue photo would help, we will ask for one before the session.

- Host: Derrick Soh
- Duration: 30 min
- Location: Cal Video
- Host time zone: Asia/Singapore
- Confirmation: Bookings are confirmed instantly.
- Payment: required, and collected on the booking page.
- Booking page: https://cal.com/natewell-derrick/follow-up
- Event type id: 6440397

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6440397&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": 6440397,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `notes` (Additional notes)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.