# Free 20-Minute Discovery Call with Marina Mercado

> A free 20-minute conversation to see if the Numerical Coaching Program is the right fit for you — no pressure, just clarity on where you are and what support would help.

- Host: Marina Mercado
- Duration: 20 min
- Location: Google Meet
- Host time zone: America/New_York
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/marina-mercado-cngn0r/free-discovery-call
- Event type id: 7166088

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7166088&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": 7166088,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "discovery-context": "…",
    "notes": "…",
    "date-of-birth": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `discovery-context` (What's going on in your life right now that made you look into coaching?)
- Optional fields: `notes` (Additional notes), `guests` (Add guests), `date-of-birth` (Date of birth (optional — nice to have ahead of the call))
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.