# Knock, knock with Andre Castillo · Katalais

> Tell us what you need this studio for: a launch, a farewell, a family milestone, a team closing a year, an artifact that needs to convey a feeling. We'll tell you whether we're the right studio for it. If we're not, we'll say so and point you somewhere better, from the experience design community. Bring yourself and your motivation. One invitation before we talk. Tell one person today something positive you have noticed about them and see what happens. Don't mention this call. Just tell them. How did it feel? Not feeling like it? That's fine too. The invitation stands, for whenever you feel like it.

- Host: Andre Castillo · Katalais
- Duration: 20 min
- Location: Cal Video
- Host time zone: America/Guatemala
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/katalais/knock-knock
- Event type id: 7312157

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7312157&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": 7312157,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…",
    "Do-you-have-a-budget-range-in-mind": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `notes` (What are you looking for?), `Do-you-have-a-budget-range-in-mind` (Do you have a budget range in mind?)
- 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.