> For the complete documentation index, see [llms.txt](https://help.mimeeq.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.mimeeq.com/api/item-masters.md).

# Item Masters

Manage item master records identified by product or item codes. These records hold operational data such as dimensions, weight, delivery time, commerce identifiers and company-specific alias codes.

Use this section to synchronize item reference data from an ERP or catalogue system. Item masters are distinct from configurable Products. Market cost prices can be read with an item master but are maintained through Market Cost Prices.

### What you can do

| Task                          | Reference                                                                                            |
| ----------------------------- | ---------------------------------------------------------------------------------------------------- |
| Find available item masters   | [List Item Masters](https://help.mimeeq.com/developers/item-masters/list-item-masters)               |
| Add a new item master         | [Create Item Master](https://help.mimeeq.com/developers/item-masters/create-item-master)             |
| Import or update item masters | [Bulk upsert Item Masters](https://help.mimeeq.com/developers/item-masters/bulk-upsert-item-masters) |
| Read one item master          | [Get Item Master](https://help.mimeeq.com/developers/item-masters/get-item-master)                   |
| Change item master            | [Update Item Master](https://help.mimeeq.com/developers/item-masters/update-item-master)             |

### Before you start

Your API key needs `itemMasters:read` to read these resources. Use `itemMasters:write` for write operations.

### Important behaviour

Item codes are unique without regard to case. Start with List Item Masters to resolve an `itemMasterId`. General updates replace the record fields, including alias codes. Bulk imports accept up to 1000 items and do not accept alias codes; inspect the result for skipped and invalid codes.


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