# Alpha Beta Design — 30-min intro with Alfonso Barreiro

> Thirty minutes to walk through your project. What you're trying to ship, when it needs to be live, and where it fits across Sprint, Engagement, or Partnership. No pitch deck. If I'm not the right call, I'll point you somewhere that is.

- Host: Alfonso Barreiro
- Duration: 30 min
- Location: Cal Video
- Host time zone: America/Los_Angeles
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/alfonso-barreiro/alpha-beta-design-30-min-intro
- Event type id: 5699199

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5699199&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": 5699199,
  "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.