# BTflow demo - 20 min with BTflow

> 20 minutes en visio pour voir BTflow sur tes chantiers : heures, coûts, marge par chantier, facturation client. On part de ta situation — comment tu suis tes heures et tes marges aujourd'hui — pas d'une présentation toute faite. Si tu as un chiffrage ou un devis sous la main, on s'en sert. Rien à installer, rien à préparer, sans engagement. Si ça t'intéresse, on reprend un créneau pour aller plus loin.

- Host: BTflow
- Duration: 20 min
- Location: Cal Video
- Host time zone: Europe/Paris
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/btflow/demo
- Event type id: 7231678

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7231678&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": 7231678,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "Comment-as-tu-connu-BTflow": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `Comment-as-tu-connu-BTflow` (Comment as-tu connu BTflow ?)
- 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.