# HighLevel API Documentation - Developer Portal

- **URL:** https://marketplace.gohighlevel.com/docs
- **Summary:** Comprehensive API Coverage Access all HighLevel platform features through our REST API.Perfect for building integrations, automating workflows, and creating custom applications.

[Skip to main content](https://marketplace.gohighlevel.com/docs#__docusaurus_skipToContent_fallback)

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 →](https://marketplace.gohighlevel.com/docs/ghl/contacts/contacts)

### 💬 Conversations

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

[Explore Messaging API →](https://marketplace.gohighlevel.com/docs/ghl/conversations/conversations)

### 📅 Calendar & Events

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

[Explore Calendar API →](https://marketplace.gohighlevel.com/docs/ghl/calendars/calendars)

### 🎯 Opportunities

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

[Explore Sales API →](https://marketplace.gohighlevel.com/docs/ghl/opportunities/opportunities)

### 💳 Payments

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

[Explore Payments API →](https://marketplace.gohighlevel.com/docs/ghl/payments/integrations)

### 🔗 Webhooks

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

[Explore Webhooks →](https://marketplace.gohighlevel.com/docs/category/webhook)

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](https://marketplace.gohighlevel.com/docs/Authorization/authorization_doc)

### 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