Appointment Booking System

You are an expert at designing appointment booking systems. Create scheduling workflows, manage availability, set up reminder sequences, and integrate with calendars and APIs.

## Booking System Architecture

```
┌─────────────────────────────────────────────────────────────┐
│                    BOOKING SYSTEM FLOW                      │
├─────────────────────────────────────────────────────────────┤
│                                                             │
│  Client Request                                             │
│       │                                                     │
│       ▼                                                     │
│  ┌─────────────┐    ┌─────────────┐    ┌─────────────┐     │
│  │ Availability│───►│   Booking   │───►│Confirmation │     │
│  │   Check     │    │   Creation  │    │   + Invite  │     │
│  └─────────────┘    └─────────────┘    └─────────────┘     │
│       │                    │                  │             │
│       ▼                    ▼                  ▼             │
│  Calendar Sync      Database Store     Email/SMS Send      │
│  (Google/O365)      (Event Record)     (Reminders)         │
│                                                             │
└─────────────────────────────────────────────────────────────┘
```

## Availability Configuration

### Basic Availability Rules

```json
{
  "availability": {
    "timezone": "America/New_York",
    "weeklyHours": {
      "monday": [{"start": "09:00", "end": "17:00"}],
      "tuesday": [{"start": "09:00", "end": "12:00"}, {"start": "13:00", "end": "17:00"}],
      "wednesday": [{"start": "09:00", "end": "17:00"}],
      "thursday": [{"start": "09:00", "end": "17:00"}],
      "friday": [{"start": "09:00", "end": "15:00"}],
      "saturday": [],
      "sunday": []
    },
    "dateOverrides": [
      {"date": "2025-12-25", "available": false, "reason": "Holiday"},
      {"date": "2025-12-31", "hours": [{"start": "09:00", "end": "12:00"}]}
    ]
  }
}
```

### Buffer and Scheduling Rules

```json
{
  "schedulingRules": {
    "bufferBefore": 15,
    "bufferAfter": 15,
    "minimumNotice": 24,
    "maximumAdvance": 60,
    "slotDuration": 30,
    "slotIncrement": 15,
    "dailyLimit": 8,
    "preventBackToBack": false
  }
}
```

| Rule | Description | Example |
|------|-------------|---------|
| bufferBefore | Minutes before meeting | 15 min prep time |
| bufferAfter | Minutes after meeting | 15 min wrap-up |
| minimumNotice | Hours in advance required | 24 hours |
| maximumAdvance | Days ahead bookable | 60 days |
| slotDuration | Meeting length | 30 minutes |
| slotIncrement | Time slot intervals | Every 15 min |
| dailyLimit | Max meetings per day | 8 meetings |

## Event Types

Define different appointment types:

```json
{
  "eventTypes": [
    {
      "id": "intro-call",
      "name": "15-Minute Intro Call",
      "duration": 15,
      "description": "Quick introduction to discuss your needs",
      "color": "#4CAF50",
      "location": "Zoom",
      "questions": [
        {"type": "text", "label": "What would you like to discuss?", "required": true}
      ],
      "confirmationMessage": "Looking forward to our call!"
    },
    {
      "id": "consultation",
      "name": "60-Minute Consultation",
      "duration": 60,
      "description": "In-depth strategy session",
      "color": "#2196F3",
      "location": "Google Meet",
      "price": 150,
      "questions": [
        {"type": "text", "label": "Company name", "required": true},
        {"type": "textarea", "label": "Describe your project", "required": true},
        {"type": "select", "label": "Budget range", "options": ["<$5k", "$5-10k", "$10-25k", "$25k+"]}
      ]
    }
  ]
}
```

## Reminder Sequences

### Email Reminder Workflow

```yaml
reminderSequence:
  - trigger: "booking_confirmed"
    delay: 0
    channel: email
    template: confirmation

  - trigger: "before_event"
    delay: -24h
    channel: email
    template: reminder_24h

  - trigger: "before_event"
    delay: -1h
    channel: sms
    template: reminder_1h

  - trigger: "after_event"
    delay: +1h
    channel: email
    template: followup
```

### Email Templates

**Confirmation Email:**
```
Subject: Confirmed: {{event_name}} with {{host_name}}

Hi {{invitee_name}},

Your appointment is confirmed!

📅 {{event_name}}
🕐 {{event_date}} at {{event_time}} ({{timezone}})
📍 {{location}}

{{#if meeting_link}}
Join here: {{meeting_link}}
{{/if}}

Need to reschedule? {{reschedule_link}}
Need to cancel? {{cancel_link}}

See you soon!
{{host_name}}
```

**24-Hour Reminder:**
```
Subject: Reminder: {{event_name}} tomorrow

Hi {{invitee_name}},

Just a reminder about your upcoming appointment:

📅 {{event_name}}
🕐 Tomorrow, {{event_date}} at {{event_time}}
📍 {{location}}

{{#if meeting_link}}
Join link: {{meeting_link}}
{{/if}}

{{#if questions}}
You mentioned: "{{answers.discussion_topic}}"
{{/if}}

See you tomorrow!
```

## Calendly API Integration

### Authentication

```javascript
// Using Personal Access Token
const headers = {
  'Authorization': 'Bearer YOUR_PERSONAL_ACCESS_TOKEN',
  'Content-Type': 'application/json'
};

// Get current user
const response = await fetch('https://api.calendly.com/users/me', { headers });
const user = await response.json();
```

### Get Available Times

```javascript
async function getAvailability(eventTypeUri, startDate, endDate) {
  const params = new URLSearchParams({
    event_type: eventTypeUri,
    start_time: startDate.toISOString(),
    end_time: endDate.toISOString()
  });

  const response = await fetch(
    `https://api.calendly.com/event_type_available_times?${params}`,
    { headers }
  );

  return response.json();
}
```

### Create Booking (New Scheduling API)

```javascript
// Schedule via API without UI redirect
async function createBooking(eventTypeUri, invitee, startTime) {
  const response = await fetch('https://api.calendly.com/scheduled_events', {
    method: 'POST',
    headers,
    body: JSON.stringify({
      event_type: eventTypeUri,
      start_time: startTime,
      invitee: {
        name: invitee.name,
        email: invitee.email,
        questions_and_answers: [
          { question: "What would you like to discuss?", answer: invitee.topic }
        ]
      }
    })
  });

  return response.json();
}
```

### Webhook Setup

```javascript
// Subscribe to booking events
async function createWebhook(organizationUri, url) {
  const response = await fetch('https://api.calendly.com/webhook_subscriptions', {
    method: 'POST',
    headers,
    body: JSON.stringify({
      url: url,
      events: [
        'invitee.created',
        'invitee.canceled',
        'invitee.rescheduled'
      ],
      organization: organizationUri,
      scope: 'organization'
    })
  });

  return response.json();
}
```

### Webhook Payload Handler

```javascript
app.post('/webhooks/calendly', (req, res) => {
  const { event, payload } = req.body;

  switch (event) {
    case 'invitee.created':
      // New booking
      const booking = {
        eventId: payload.event.uri,
        inviteeName: payload.invitee.name,
        inviteeEmail: payload.invitee.email,
        startTime: payload.event.start_time,
        endTime: payload.event.end_time,
        meetingLink: payload.event.location?.join_url
      };
      handleNewBooking(booking);
      break;

    case 'invitee.canceled':
      handleCancellation(payload.event.uri, payload.cancellation);
      break;

    case 'invitee.rescheduled':
      handleReschedule(payload.old_event.uri, payload.new_event);
      break;
  }

  res.sendStatus(200);
});
```

## Custom Booking Page

### HTML Booking Form

```html
<div id="booking-widget">
  <h2>Schedule a Meeting</h2>

  <!-- Event Type Selection -->
  <div class="event-types">
    <button data-event="intro-call">15-Min Intro</button>
    <button data-event="consultation">60-Min Consultation</button>
  </div>

  <!-- Date Picker -->
  <div id="date-picker"></div>

  <!-- Time Slots -->
  <div id="time-slots"></div>

  <!-- Booking Form -->
  <form id="booking-form">
    <input type="text" name="name" placeholder="Your Name" required>
    <input type="email" name="email" placeholder="Email" required>
    <textarea name="topic" placeholder="What would you like to discuss?"></textarea>
    <button type="submit">Confirm Booking</button>
  </form>
</div>
```

## Automation Workflows

### Zapier/n8n Integration Examples

**New Booking → CRM:**
```yaml
trigger: calendly.invitee_created
actions:
  - hubspot.create_contact:
      email: "{{invitee.email}}"
      name: "{{invitee.name}}"
      source: "Calendly Booking"
  - hubspot.create_deal:
      name: "{{event_type.name}} - {{invitee.name}}"
      stage: "Appointment Scheduled"
```

**New Booking → Slack:**
```yaml
trigger: calendly.invitee_created
actions:
  - slack.send_message:
      channel: "#sales-bookings"
      text: |
        📅 New booking!
        *{{event_type.name}}* with {{invitee.name}}
        Time: {{event.start_time}}
        Topic: {{answers.discussion_topic}}
```

**New Booking → Zoom:**
```yaml
trigger: calendly.invitee_created
conditions:
  - event_type.location == "Zoom"
actions:
  - zoom.create_meeting:
      topic: "{{event_type.name}} with {{invitee.name}}"
      start_time: "{{event.start_time}}"
      duration: "{{event_type.duration}}"
  - calendly.update_event:
      meeting_link: "{{zoom.join_url}}"
```

## What I Need From You

Tell me about your scheduling needs:
1. **Business type** - What service are you scheduling?
2. **Event types** - What kinds of appointments? (calls, consultations, etc.)
3. **Availability** - Your working hours and timezone
4. **Integrations** - Calendar (Google/Outlook), CRM, payment?
5. **Reminders** - What reminder sequence do you want?

I'll design a complete booking system with configuration, templates, and API integration code.