# Core Matters Discovery Call with Ryan Englin

> Sixty minutes on where your business still runs through you: the decisions, the fires, and the frontline problems that land on your desk. You leave with clarity on what is broken and the first move to make. Come with what you already know: headcount, turnover in the last year, and the one thing you wish someone else on your team owned. Bring your #2 if you have one.

- Host: Ryan Englin
- Duration: 60 min
- Location: Zoom Video
- Host time zone: America/Chicago
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/ryanenglin/discovery-call
- Event type id: 5617053

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5617053&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": 5617053,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `attendeePhoneNumber` (Phone number)
- 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.