# Downpay: 1:1 Discovery Call with Diana with Diana Birsan

> Book a call with Diana, cofounder of Downpay. This call is for merchants who are exploring Downpay or want to discuss partial payment strategies and workflows. If the available times don't work for your schedule, please reach out and I'd be happy to accommodate. If you're already using Downpay and need help with setup or troubleshooting, our support team will be happy to assist at support@hypehound.io or via this booking link: https://cal.com/lidija

- Host: Diana Birsan
- Duration: 20, 30, 45 min
- Location: Google Meet
- Host time zone: America/Toronto
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/dianabirsan/chat
- Event type id: 493147

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=493147&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": 493147,
  "start": "<UTC ISO 8601 start from the slots response>",
  "lengthInMinutes": 20,
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `notes` (Please share details you'd like to discuss so I can better prepare for this call.)
- 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.
- `lengthInMinutes` picks one of 20, 30, 45; pass the same value to the slots request as `duration`.