Relative Adjustment
Add or subtract inventory for an inventory item at a location. Use this endpoint only when you do not know absolute quantities. For example, making order-related inventory changes through a third-party may require relative adjustments. Otherwise, use the [Absolute adjustment](/developer/api-reference/rest/admin/management/inventory/adjustments#absolute-adjustment) endpoint for updating inventory.
**Limits**
* For maximum inventory levels, see [Inventory adjustments](/developer/docs/admin/catalog-and-inventory/inventory-adjustments#inventory-adjustments).
* Limit of 2000 items for payload length, see [Optimizing performance](/developer/docs/admin/catalog-and-inventory/inventory-adjustments#optimizing-performance) for more information.
Authentication
X-Auth-Tokenstring
### OAuth scopes
| UI Name | Permission | Parameter |
|:--------|:-----------|:----------|
| Store Inventory | read-only | `store_inventory_read_only` |
| Store Inventory | modify | `store_inventory` |
### Authentication header
| Header | Argument | Description |
|:-------|:---------|:------------|
| `X-Auth-Token` | `access_token` | For more about API accounts that generate `access_token`s, see [API Accounts and OAuth Scopes](/developer/docs/overview/api-accounts#api-accounts). |
### Further reading
For example requests and more information about authenticating BigCommerce APIs, see [Authentication and Example Requests](/developer/docs/overview/api-accounts).
For more about BigCommerce OAuth scopes, see [API Accounts and OAuth Scopes](/developer/docs/overview/api-accounts#oauth-scopes).
For a list of API status codes, see [API Status Codes](/developer/api-reference/rest/overview#rest-http-status-codes).
Request
This endpoint expects an object.
items
One of the sku, product_id, or variant_id is required to identify the item.
reason
Reason for the adjustment operation.
Response
Request has been successfully processed.
transaction_id
Unique identifier of performed action.
Errors
422
Unprocessable Entity Error
