# Intro call with Barth with Barth Brayan Serceña

> Tell me about your business and what you'd like to put online. We'll talk through what it needs and how long it would take, and decide together whether working with me makes sense. Questions are welcome, and you don't need to prepare anything.

- Host: Barth Brayan Serceña
- Duration: 30 min
- Location: Google Meet
- Host time zone: Asia/Manila
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/barth-sercena/intro-call
- Event type id: 7775821

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7775821&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": 7775821,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "Business-name": "…",
    "What-kind-of-business-is-it": "…",
    "-What-do-you-need": "…",
    "Do-you-have-a-website-now": "…",
    "When-would-you-like-to-start": "…",
    "Your-website-address": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `Business-name` (Business name), `What-kind-of-business-is-it` (What kind of business is it?), `-What-do-you-need` (What do you need?), `Do-you-have-a-website-now` (Do you have a website now?), `When-would-you-like-to-start` (When would you like to start?)
- Optional fields: `Your-website-address` (Your website address)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.