# Un échange téléphonique with Nicolas Karasiewicz

> Un appel de 15 minutes pour faire le point sur là où vous en êtes, mettre des mots sur ce que vous traversez et clarifier votre besoin. Un échange simple, humain, pour voir si je peux vous accompagner et ouvrir une première perspective.

- Host: Nicolas Karasiewicz
- Duration: 15 min
- Location: +33698893469
- Host time zone: Europe/Paris
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/nicolas-karasiewicz-xjt26u/un-echange-telephonique
- Event type id: 5563732

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5563732&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": 5563732,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "Prenom": "…",
    "attendeePhoneNumber": "…",
    "Thematique-de-l-appel": "…"
  }
}
```

- Required fields: `name` (Your name), `Prenom` (prenom.), `email` (Email address), `attendeePhoneNumber` (Phone number), `Thematique-de-l-appel` (Thématique de l'appel)
- Optional fields: `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.