# 2. Étude de faisabilité with Ibrahima Barry

> Une session d’analyse stratégique pour évaluer la faisabilité technique et fonctionnelle de votre idée. Nous passons en revue vos objectifs, vos contraintes et vos choix technologiques possibles pour déterminer la meilleure approche avant le développement.

- Host: Ibrahima Barry
- Duration: 30 min
- Location: Google Meet, Attendee phone number
- Host time zone: Europe/Paris
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/barryib/etude-de-faisabilite
- Event type id: 3744126

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3744126&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": 3744126,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `attendeePhoneNumber` (Phone number), `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.
- `location` is optional; without it the booking uses the event’s first location.