# Complementary Strategy Call - EST with USARION

> What to expect in this call: Your product overview Goals, target users, current blockers Review of your brief, designs, or research Timeline, budget, tech constraints How we work and what delivery looks like Next steps if we're a fit 💼 Team experience with Meta, Red Bull & Shell Recharge 📈 15+ years in UI/UX and product design ⚡ Up to 50–300% conversion lift for clients 📧 imran@usarion.com 📧 hello@usarion.com 🔗 www.usarion.com

- Host: USARION
- Duration: 30, 60 min
- Location: Google Meet
- Host time zone: Asia/Dhaka
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/usarion/book-est
- Event type id: 7709535

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7709535&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": 7709535,
  "start": "<UTC ISO 8601 start from the slots response>",
  "lengthInMinutes": 30,
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `title` (What is this meeting about?), `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.
- `lengthInMinutes` picks one of 30, 60; pass the same value to the slots request as `duration`.