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# API Integration
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REST endpoints, AJAX interfaces, and integration patterns for connecting external systems.
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## Capabilities
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### REST API Endpoints
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```python { .api }
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# Entity CRUD operations via HTTP
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GET    /creme_core/entity/           # List entities
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POST   /creme_core/entity/           # Create entity
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GET    /creme_core/entity/{id}/      # Get entity details
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PUT    /creme_core/entity/{id}/      # Update entity
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DELETE /creme_core/entity/{id}/      # Delete entity
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```
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### AJAX Views
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```python { .api }
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# AJAX endpoints for dynamic UI updates
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/creme_core/ajax/entity/search/    # Entity search
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/creme_core/ajax/relation/create/  # Create relationships
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/creme_core/ajax/brick/reload/     # Reload dashboard bricks
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```
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### External Integration
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```python { .api }
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# Integration with external systems
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def sync_external_contacts(api_client):
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    """
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    Synchronize contacts with external CRM system.
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    Parameters:
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    - api_client: External API client instance
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    """
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```