# Primera llamada · Discovery call with TrinaxCode

> Cuéntame sobre tu proyecto en 15 minutos. Te doy mi opinión, te digo si puedo ayudarte y en qué rango de tiempo y precio. Después te envío una propuesta en 48 horas. / Tell me about your project in 15 minutes. I'll give you feedback, tell you if I can help and the rough time and price range, then send you a proposal within 48 hours.

- Host: TrinaxCode
- Duration: 15 min
- Location: Cal Video
- Host time zone: America/Managua
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/trinax-code-xst3w0/primera-llamada
- Event type id: 7867199

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7867199&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": 7867199,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What is this meeting about?)
- 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.