How Appointment Scheduling APIs Work

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