# Not Just a Hello — This is Where Transformation Begins with Engine Stack

> Talk with the founder. The right 30 minutes can go a long way. Here’s how it works: Pick a time that works for you. Fill in the questions to make our call productive On our call, we'll deep dive into your questions and map out actionable next steps.

- Host: Engine Stack
- Duration: 30 min
- Location: Google Meet
- Host time zone: Asia/Bangkok
- Confirmation: Bookings are confirmed instantly.
- Payment: required, and collected on the booking page.
- Booking page: https://cal.com/engine-stack/intro
- Event type id: 773409

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=773409&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": 773409,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "title": "…",
    "business-type": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email), `title` (Are you using any lead generation tools already ?), `business-type` (Which one describe you ?)
- Optional fields: none
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.