Scheduling APIs let applications interact with calendars programmatically.
Common Operations
Get availability: Query free time slots.
Create appointment: Book a specific time.
Update appointment: Reschedule.
Cancel appointment: Remove booking.
Manage contacts: Create/update customer records.
Request/Response
GET /availability?date=2024-09-05
→ { slots: ["10:00", "14:00", "16:00"] }
POST /appointments
{ time: "2024-09-05T14:00", contact: {...} }
→ { id: "apt_123", confirmed: true }Authentication
APIs require authentication:
- API keys
- OAuth tokens
- JWT
Keep credentials server-side.
Providers
Different providers have different APIs:
- GoHighLevel
- Google Calendar
- Calendly
- Microsoft Graph
- Custom
Abstraction Layer
Build an abstraction so your app isn't tightly coupled to one provider.
Bookux
Bookux builds scheduling API integrations that connect your website to your calendar.
Related: What Is an Appointment Scheduling API? · Appointment Booking Webhooks