# Inventory

Inventory allows you to track stock quantity per SKU and optionally per [supply channel](/api/projects/channels.md).

The amount of time it takes for updates to be reflected on an `InventoryEntry` depends on where those changes originate. For details, see [Inventory checks and consistency](/api/inventory-overview.md#inventory-checks-and-consistency).

Learn more about Inventory in our self-paced Inventory modeling module.

## Representations

#### InventoryEntry

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntry).

#### InventoryEntryStockLevels

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryStockLevels).

#### InventoryEntryDraft

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryDraft).

#### InventoryPagedQueryResponse

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryPagedQueryResponse).

#### InventoryEntryReference

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryReference).

#### InventoryEntryResourceIdentifier

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryResourceIdentifier).

## Get InventoryEntry

### Get InventoryEntry by ID

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/\{id}:GET).

### Get InventoryEntry by Key

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/key=\{key}:GET).

## Query InventoryEntries

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory:GET).

## Check if InventoryEntry exists

### Check if InventoryEntry exists by ID

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/\{id}:HEAD).

### Check if InventoryEntry exists by Key

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/key=\{key}:HEAD).

### Check if InventoryEntry exists by Query Predicate

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory:HEAD).

## Create InventoryEntry

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory:POST).

## Update InventoryEntry

### Update InventoryEntry by ID

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/\{id}:POST).

### Update InventoryEntry by Key

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/key=\{key}:POST).

## Update actions

#### Add Quantity

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryAddQuantityAction).

#### Remove Quantity

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryRemoveQuantityAction).

#### Change Quantity

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntryChangeQuantityAction).

#### Set Key

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetKeyAction).

#### Set RestockableInDays

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetRestockableInDaysAction).

#### Set ExpectedDelivery

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetExpectedDeliveryAction).

#### Set SupplyChannel

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetSupplyChannelAction).

#### Set Custom Type

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetCustomTypeAction).

#### Set CustomField

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetCustomFieldAction).

#### Set Reservation Expiration In Minutes

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetReservationExpirationInMinutesAction).

#### Set Inventory Limits

When you introduce or change limits, existing Line Items in Carts might fall outside the new limits. During the next [Cart update](/api/carts-orders-overview.md#update-a-cart) after the change:

- A Line Item whose quantity is outside the limits is removed.
- If a requested quantity or supply channel change exceeds a limit, the request is rejected.

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetInventoryLimitsAction).

#### Set Safety Stock

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetSafetyStockAction).

#### Set Reorder Point

[type definition](/api/projects/inventory.md?urn=ctp:api:type:InventoryEntrySetReorderPointAction).

## Delete InventoryEntry

### Delete InventoryEntry by ID

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/\{id}:DELETE).

### Delete InventoryEntry by Key

[endpoint definition](/api/projects/inventory.md?urn=ctp:api:endpoint:/\{projectKey}/inventory/key=\{key}:DELETE).

## Related pages

- [Area overview page with navigation](/api.md)
- [Previous page: Overview](/api/inventory-overview.md)
- [Next page: Reservations](/api/projects/reservations.md)