# 15-Minute Discovery Call with GrowSume

> Let's share a MILLION DOLLAR SYSTEM that can consistently bring 5-10 ideal HVAC clients each month. ----------------------- 🔥 Get 5-10 HVAC jobs with our 30-Day Trial!

- Host: GrowSume
- Duration: 15 min
- Location: Google Meet
- Host time zone: Asia/Kolkata
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/growsume/discovery-call
- Event type id: 1275810

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=1275810&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": 1275810,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "phone-number": "…",
    "company-name": "…",
    "city": "…",
    "current-revenue": "…",
    "way-of-marketing": "…",
    "confirmation": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `phone-number` (Can you please share your preferred phone number for us to contact you?), `company-name` (Company Name), `city` (Which city and county is your business located in?), `current-revenue` (How much is your current annual revenue?), `way-of-marketing` (How do you currently acquire most of your clients? This helps us identify areas where we can provide extra value. (Select all that apply)), `confirmation` (****I confirm that I will attend the scheduled time and won’t miss the appointment.****)
- Optional fields: `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.