# 4 Weeks to Less Stress with Piotr Mechliński

> One payment of €1,500 covers all four sessions — four 60-minute 1:1 sessions online, across four weeks. You are booking the first session now. We schedule the remaining three together as we go, so each one can sit where it suits your week. Instruments required: Oura ring + Muse headband, roughly €650. You buy them and you keep them — not included in the €1,500.

- Host: Piotr Mechliński
- Duration: 60 min
- Location: MS Teams
- Host time zone: Europe/Warsaw
- Confirmation: Bookings are confirmed instantly.
- Payment: required, and collected on the booking page.
- Booking page: https://cal.com/piotr-mechlinski/4-weeks
- Event type id: 6993837

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6993837&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": 6993837,
  "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.