> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.merge.dev/merge-unified/crm/custom-objects/associations/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.merge.dev/_mcp/server.

# Associations

> Build once. Connect to every API, tool, and LLM. Ship products and agents to production without owning the integration stack.


## API Docs

- Associations [/custom-object-classes/{custom_object_class_id}/custom-objects/{object_id}/associations](https://docs.merge.dev/merge-unified/crm/custom-objects/associations/custom-object-classes-custom-objects-associations-list.md)
- Associations [/custom-object-classes/{source_class_id}/custom-objects/{source_object_id}/associations/{target_class_id}/{target_object_id}/{association_type_id}](https://docs.merge.dev/merge-unified/crm/custom-objects/associations/custom-object-classes-custom-objects-associations-update.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://docs.merge.dev/merge-unified/crm/custom-objects/associations/openapi.json)
- [OpenAPI YAML](https://docs.merge.dev/merge-unified/crm/custom-objects/associations/openapi.yaml)