# Founder call · 15 min with Levin Föhrding

> A short call with Levin, founder of rankyn. Bring your shop URL – we look at where you stand in AI answers and whether rankyn is a fit. No pitch deck.

- Host: Levin Föhrding
- Duration: 15 min
- Location: Cal Video
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/levin-rankyn/founder-call
- Event type id: 7594365

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7594365&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": 7594365,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "store-url": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `store-url` (Store URL)
- 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.