# Free Discovery Call 免費諮詢通話 with Max Lau

> A free, no-pressure call to learn about your business and your product's current state — from early prototype to live with real users. What we'll cover: - What you're building and who it's for - How your product was built and what tools you used - What's working, and what (if anything) needs attention before you scale No technical prep required — just come ready to talk about what you've built. You'll walk away with an honest, plain-language read on where things stand and clear next steps, with zero pressure to continue. 免費、無壓力的通話，讓我們了解你的業務與產品目前的狀態——從早期雛形到已有真實用戶。 我們會聊到： - 你在做什麼、目標客群是誰 - 產品是怎麼做出來的、用了哪些工具 - 哪些做得好、哪些在擴大規模前可能需要注意 不需要任何技術背景準備，只要準備好聊聊你做的東西就好。通話結束後，你會得到誠實、白話文的現況分析，以及清楚的下一步建議——完全沒有壓力要你繼續合作。

- Host: Max Lau
- Duration: 15 min
- Location: Google Meet
- Host time zone: Asia/Hong_Kong
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/inertia-max/15min-help
- Event type id: 7013980

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7013980&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": 7013980,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `attendeePhoneNumber` (Phone number), `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.