# Intro call with Joey from Mattermore with Joey | Mattermore

> A 25-minute introduction. We’ll talk about your vision, any problems and your options. We'll both leave knowing whether Mattermore is the right fit, and what a sensible next step would be, even if it's with someone else. No prep needed. About me I've spent a decade making brand and growth decisions for global enterprises and resource-constrained challengers, from Fiserv and IBM to Spark, to GGV-backed start-ups, and global and independent agencies.

- Host: Joey | Mattermore
- Duration: 25 min
- Location: Cal Video
- Host time zone: Europe/London
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/joey-mattermore/intro-meeting
- Event type id: 7474822

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7474822&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": 7474822,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…",
    "Brand-name": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `notes` (Additional notes), `guests` (Add guests), `Brand-name` (Brand name)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.