The Inventory API is used to create and manage inventory item records, and then convert these inventory items into product offers on eBay marketplaces. The Inventory API has the following entities:
- Location: a seller must have at least one store or warehouse inventory location set up before that seller can start creating and publishing offers with the Inventory API. Every inventory location must also have a seller-defined merchant location key value.
- Inventory Item: before a product can be sold in an offer on an eBay marketplace, an inventory item record must exist for that product. An inventory item record contains such things as product details, item condition, quantity available. Every Inventory Item must also have a seller-defined SKU value, and this value must be unique across the seller's inventory.
- Offer: an offer is what becomes a live eBay listing. An offer is first created, and then it is published with the Inventory API. Each offer must be associated with an eBay marketplace, an inventory item, an inventory location, and a category ID. The offer will contain quantity available for the offer, the listing description, and an offer price. Every offer must also reference a payment, a fulfillment, and a return business policy, so the seller must be opted in, and have business policies available to apply against the offers.
- Inventory Item Group: an inventory item group is necessary if the seller would like to create and manage multiple-variation listings through the Inventory API. An inventory item group is a collection of similar inventory items that might vary on a couple of aspects like color and size.
- Compatible Products: the product compatibility calls allow the seller to create a compatible vehicle list, or vehicles that are compatible with a motor vehicle part or accessory.
The Inventory API is more-or-less a "standalone" REST-based API, but it does have the following relationships with other APIs:
- Trading API: sellers may use the Trading API to get some listing-related metadata, and may also want to use GetItem call to view the listing that they have created through the Offer calls
- Account API: sellers can use the Account API to opt in to Business Policies, and to create and manage business policies (that are used/referenced with the createOffer call in the Inventory API). Inventory API users may also need to use the getRateTables call of the Account API to get the unique identifiers of shipping rate tables that they may want to apply to a fulfillment business policy
- Fulfillment API: sellers can use the Fulfillment API to get order details and manage shipment tracking.
Business use cases
Below are the high-level use cases addressed by the Inventory API.
- Create and manage inventory locations
- Create and manage inventory item records
- Create offers
- Publish and manage offers
- Migrate existing eBay listings to the Inventory API data model using the bulkMigrateListings call
The following use cases are not necessarily required, but they are available to sellers:
- Get expected listing fees for unpublished offers
- Create and manage inventory item groups (necessary if creating and managing multiple-variation listings)
- Create compatible vehicle lists for motor vehicle parts (helpful if creating and managing motor vehicle parts or accessory listings)
- Disable or enable inventory locations
To use the Inventory API (or any other eBay public API), the user must have an eBay Developers Program account, and the user's seller account must be opted in to Business Policies. If using the bulkMigrateListings call, there are additional requirements than the active eBay listing must meet before that listing can be converted to the Inventory API data model. These requirements are covered in the Selling Integration Guide.
The Inventory API is supported on all eBay marketplaces that have API support. However, with the initial release, the Inventory API does have the following restrictions:
- Only Good 'Til Cancelled (GTC), fixed-priced listings are supported; no auction listings and no listing durations of varying days
- Traditional 'ship-to-home', Click and Collect (supported in UK, Australia and Germany), and In-Store Pickup (US only) inventory supported
- Below are the eBay listing features that can be set up through the Add listing calls of the Trading API, but cannot be set up through the Inventory API. However, note that these listing features will persist on traditional eBay listings that are migrated to the Inventory model:
- Best Offers
- Listing-level Buyer Requirements (account-level Buyer Requirements are still valid for Inventory model listings)
- Charity donations from sale proceeds
- Use of Listing Designer templates
- Listing enhancements like bold listing title or Gallery Plus
- Listing in two categories (secondary category)