# Fit call: outbound advisory (20 min, free) with Macklin Buckler

> We'll look at the decision you're facing and agree whether monthly advisory is the right fit. If it is, we'll outline a useful first month before anything is invoiced. Three short questions below help me prepare, so we spend the 20 minutes on your decision rather than on background. If it's clearly not a fit, I'll tell you by email and save us both the time.

- Host: Macklin Buckler
- Duration: 20 min
- Location: Google Meet
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/macklin-buckler/get-to-know-each-other
- Event type id: 6667341

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6667341&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": 6667341,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "company-website": "…",
    "what-you-sell": "…",
    "gtm-decision": "…",
    "who-acts": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Work email), `company-website` (Company website), `what-you-sell` (What do you sell, and who buys it today?), `gtm-decision` (What GTM decision is in front of you?), `who-acts` (Who would act on the advice, and how much time can they give it?)
- Optional fields: `notes` (Anything else? (optional)), `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.