# Discovery call (30 min) with DEVRUBY

> Free 30-minute video call. Tell us which process or system you want to improve and we will tell you honestly whether custom software, an integration or an automation makes sense, with a clear next step. No commitment.

- Host: DEVRUBY
- Duration: 30 min
- Location: Cal Video
- Host time zone: America/Caracas
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/devruby/discovery-call
- Event type id: 7505139

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7505139&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": 7505139,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "empresa": "…",
    "problema": "…",
    "attendeePhoneNumber": "…",
    "presupuesto": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `empresa` (Company), `problema` (What do you want to solve?)
- Optional fields: `attendeePhoneNumber` (WhatsApp / phone), `guests` (Add guests), `presupuesto` (Approximate budget)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.