# Order item data extension

An order item data extension is an object that lets you specify any key-value pairs you want. Order data extensions are optional and enable your organization to capture more robust information about your order items.

 To get started with this API, create a data extension for the order items you previously created.

 - [POST /v2.1/orderItems/{orderItemRef}/extensions/{dataExtensionName}](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/createorderitemdataextension.md): Creates an order item data extension. To avoid creating key-value pairs that already exist in the data extension for an order item, first retrieve all the data extensions for an order item to check th
 - [GET /v2.1/orderItems/{orderItemRef}/extensions/{dataExtensionName}](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/retrieveorderitemdataextension.md): Retrieves a data extension for an order item.
 - [PUT /v2.1/orderItems/{orderItemRef}/extensions/{dataExtensionName}](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/putorderitemdataextension.md): Fully updates a data extension for an order item, replacing the entire resource including all the key-value pairs with the data you send in the request. To update certain key-value pairs only, use th
 - [PATCH /v2.1/orderItems/{orderItemRef}/extensions/{dataExtensionName}](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/updateorderitemdataextension_1.md): Partially updates a data extension for an order, replacing only those key-value pairs in the resource that you provide in the request.
 - [DELETE /v2.1/orderItems/{orderItemRef}/extensions/{dataExtensionName}](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/deleteorderitemdataextension.md): Deletes the data extension for an order item, including all the key-value pairs in the data extension. To delete certain key-value pairs only, use the Delete key-value pairs from a data extension end
 - [DELETE /v2.1/orderItems/{orderItemRef}/extensions/{dataExtensionName}/fields](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/updateorderitemdataextension.md): Deletes the key-value pairs you provide in the `name` query parameter from a data extension for an order item. For example, if your data extension contains the `firstTimeOrder` and `storeLocation` key
 - [GET /v2.1/orderItems/{orderItemRef}/extensions](https://api-docs.sitecore.com/cdp/order-rest-api/order-item-data-extension/retrieveorderitemdataextensions.md): Retrieves the URL for the order item's data extension. This lets you check if the data extension exists.