# Demo – Gems with Erwan Corre

- Host: Erwan Corre
- Duration: 45 min
- Location: Google Meet
- Host time zone: Europe/Paris
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/ecorre/demo-call
- Event type id: 2910216

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=2910216&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": 2910216,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "Pour-quelle-marque-travaillez-vous": "…",
    "Combien-d-pensez-vous-en-Meta-Ads-par-mois": "…",
    "Faites-vous-d-j--des-Partnership-Ads": "…",
    "attendeePhoneNumber": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `Pour-quelle-marque-travaillez-vous` (Pour quelle marque travaillez-vous ?), `Combien-d-pensez-vous-en-Meta-Ads-par-mois` (Combien dépensez-vous en Meta Ads par mois ?), `Faites-vous-d-j--des-Partnership-Ads` (Faites-vous déjà des Partnership Ads ?)
- Optional fields: `attendeePhoneNumber` (Phone number), `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.