# The Hidden $ Call with Rayan Chakir

> Thirty minutes, and you'll see how much money is sitting in the clients you already have, and which lever gets it fastest.

- Host: Rayan Chakir
- Duration: 15, 30, 45, 60 min
- Location: Google Meet
- Host time zone: America/Chicago
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/rayan-chakir-repuvance/the-hiddenrev-call
- Event type id: 7242202

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7242202&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": 7242202,
  "start": "<UTC ISO 8601 start from the slots response>",
  "lengthInMinutes": 45,
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "How-many-active-clients": "…",
    "Monthly-revenue-roughly": "…",
    "Monthly-retention--roughly": "…",
    "Are-you-the-sole-decision-maker": "…",
    "Booked-by": "…",
    "attendeePhoneNumber": "…",
    "smsReminderNumber": "…",
    "What-do-you-sell-besides-ads---web--SEO--CRM--etc": "…",
    "Roughly-how-many-referrals-from-clients-in-the-last-12-months": "…",
    "Caller-notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `How-many-active-clients` (How many active clients?), `Monthly-revenue-roughly` (Monthly revenue roughly?), `Monthly-retention--roughly` (Monthly retention, roughly?), `Are-you-the-sole-decision-maker` (Are you the sole decision maker?), `Booked-by` (Booked by)
- Optional fields: `attendeePhoneNumber` (Phone number), `smsReminderNumber` (Phone number (Text notifications)), `guests` (Add guests), `What-do-you-sell-besides-ads---web--SEO--CRM--etc` (What do you sell besides ads? (web, SEO, CRM, etc.)), `Roughly-how-many-referrals-from-clients-in-the-last-12-months` (Roughly how many referrals from clients in the last 12 months?), `Caller-notes` (Caller notes)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.
- `lengthInMinutes` picks one of 15, 30, 45, 60; pass the same value to the slots request as `duration`.