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HighLevel API Documentation

Complete REST API documentation for the HighLevel CRM platform. Build powerful integrations with our comprehensive developer resources.

Get Started with APIAuthentication Guide

Comprehensive API Coverage

Access all HighLevel platform features through our REST API. Perfect for building integrations, automating workflows, and creating custom applications.

🏢 CRM & Contacts

Manage contacts, leads, and customer data with full CRUD operations, tagging, and custom fields.

Explore Contacts API →

💬 Conversations

Handle SMS, email, and call communications. Send messages, manage threads, and track conversations.

Explore Messaging API →

📅 Calendar & Events

Schedule appointments, manage calendar events, and handle booking workflows programmatically.

Explore Calendar API →

🎯 Opportunities

Track sales pipeline, manage deals, and automate opportunity workflows with our sales API.

Explore Sales API →

💳 Payments

Process payments, manage subscriptions, and handle transaction data through our payment API.

Explore Payments API →

🔗 Webhooks

Real-time notifications for 50+ events. Stay updated with instant webhook callbacks.

Explore Webhooks →

Quick Start Guide

  1. Choose Integration Type - Marketplace app or Private integration
  2. Set Up Authentication - OAuth 2.0 or Private Integration Token
  3. Make Your First API Call - Test with our interactive documentation
  4. Build & Deploy - Use our SDKs and code examples
Start Building Now

Example API Request

curl -X GET \
  https://services.leadconnectorhq.com/contacts/ \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json"

Developer Resources

📖 API Reference

Complete endpoint documentation with request/response examples

🔐 Authentication

OAuth 2.0 and Private Integration setup guides

⚡ Webhooks

Real-time event notifications and webhook setup

🏪 Marketplace

Build and distribute apps in the HighLevel marketplace