Native integrations and Zapier cover most use cases, but if you’re building a custom app, syncing high data volumes, or connecting proprietary systems, you need the API directly. This is the GHL API in practical terms, not the full reference docs, but what you need to know before you start building.
API Basics
| Details | |
|---|---|
| Current version | v2 (v1 is deprecated, end-of-support, no new keys) |
| Architecture | REST, standard HTTP methods (GET/POST/PUT/DELETE), JSON responses |
| Auth | OAuth 2.0 (Marketplace apps) or Private Integration Tokens (internal tools) |
| Rate limits | ~100 requests per 10-second burst (varies by endpoint/plan) |
| Docs | Official reference at highlevel.stoplight.io and developers.gohighlevel.com |
Two Ways to Authenticate
🔑 Private Integration Token
Best for internal tools used within your own sub-account. Simpler setup, no OAuth flow needed. Not for public distribution.
🔐 OAuth 2.0 (Marketplace App)
Required for apps distributed to other agencies, or for multi-account access without individual API keys per account. Same pattern as Salesforce/HubSpot OAuth.
What the API Covers
Endpoints are organized into groups covering the platform’s major areas:
Contacts
Create, read, update contact records, the most-used endpoint group. Tag, segment, and sync from external CRMs.
Opportunities/Pipelines
Create opportunities, update pipeline stages programmatically as leads move through your funnel.
Calendars/Appointments
Book, reschedule, and manage appointments from external systems.
Messaging
Send SMS and email, and read conversation history programmatically.
Payments
Access payment and invoice data for reporting or reconciliation.
Workflows
Trigger workflows externally and manage automation from your own systems.
Webhooks: The “Reverse API”
Where the API is you pulling data from GoHighLevel, webhooks are GoHighLevel pushing data to you. When an event happens, contact created, appointment booked, pipeline stage changed, GHL sends a JSON payload to your endpoint automatically, usually within 1–5 seconds.
// Set up: Automation → Workflows → new workflow Trigger: Appointment Booked Action: Webhook → POST to https://yourapp.com/webhook // GHL retries failed deliveries automatically
This event-driven pattern is what powers most real integrations: instead of polling the API repeatedly, your server just waits for the webhook and reacts. Build retry logic with backoff into anything doing bulk or high-frequency calls.
Do You Actually Need the API?
Before building custom, check two things: does GoHighLevel already have a native integration for what you need, and could Automation workflows or Zapier handle it with far less development time? The API is worth the OAuth complexity when you have proprietary systems, high data volumes, or need logic no-code tools can’t replicate. For most agencies, native funnels and workflows cover 90% of needs without touching code.
New to the platform overall? Start with our GoHighLevel review or the features guide.
Start Building — Free 30-Day Trial Full API and platform accessFrequently Asked Questions
What is the GoHighLevel API?
A REST API (currently v2) that lets developers read and write data, contacts, pipelines, appointments, and more, and receive real-time webhooks when events happen inside GoHighLevel. It uses OAuth 2.0 or Private Integration Tokens for authentication.
Is the GoHighLevel API free to use?
Basic API access is available on all plans. Agency-level tokens and certain advanced OAuth features require the Agency Pro ($497) plan.
What’s the difference between GHL API v1 and v2?
V1 used simple API-key authentication and has reached end-of-support, no new keys can be generated. V2 uses OAuth 2.0, has broader endpoint coverage, better rate limiting, and improved documentation. Build new integrations on v2.
What are GoHighLevel webhooks used for?
Webhooks let GoHighLevel push data to your server automatically when an event occurs (appointment booked, contact created), instead of you polling the API repeatedly. They’re configured through Automation → Workflows with a Webhook action.