API-First Design: How Developers Extend FrontDeskOS

Built for Developers, Not Just End Users

Most front desk platforms treat their API as an afterthought — a limited set of endpoints bolted on after the core product ships. FrontDeskOS took the opposite approach. Our platform was designed API-first: every action available in the dashboard is available through the API, with the same real-time performance and the same data fidelity.

This matters because the most innovative use cases come from engineering teams connecting FrontDeskOS to their own systems in ways we never anticipated.

Core API Capabilities

The FrontDeskOS REST API covers the full platform surface area:

• Call management: Retrieve call logs, transcripts, recordings, and sentiment scores programmatically
• Appointment scheduling: Create, update, and cancel appointments via API with conflict detection
• Contact management: CRUD operations on contacts with deduplication and merge capabilities
• Webhook subscriptions: Register listeners for 30+ event types including call.completed, appointment.booked, and lead.qualified
• Configuration: Programmatically update greetings, routing rules, business hours, and escalation protocols

Visit the developer portal for full documentation, SDKs, and interactive API explorer.

Webhook Architecture

FrontDeskOS webhooks deliver events in real time with at-least-once delivery and configurable retry logic. Each event includes a full payload — not just an ID that requires a follow-up API call. This means your webhook handler has everything it needs to process the event without additional round trips.

Common Webhook Patterns

• Lead routing: When a call is qualified as a new lead, trigger assignment logic in your CRM
• Escalation alerts: When sentiment drops below a threshold, notify the team lead via Slack or PagerDuty
• Analytics pipelines: Stream call data to your data warehouse for custom reporting
• Custom integrations: Connect to niche industry tools that FrontDeskOS doesn't natively support

Extension Points and Custom Logic

Beyond the API and webhooks, FrontDeskOS supports custom call flows through our scripting engine. You can define conditional routing logic, custom qualification questions, and dynamic responses based on external data lookups — all without modifying platform code.

Browse our pre-built integrations for common tools, or build exactly what you need with the API. Our engineering team is always available to help — see the about page for how to reach us.