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

# Inventory API

- [Overview](https://developer.esw.com/inventory/inventory-api/overview.md): Inventory API and the two Available-to-Sell (ATS) endpoints that return SKU-level inventory availability.
- [Authentication](https://developer.esw.com/inventory/inventory-api/authentication.md): How to authenticate Inventory API requests with a Bearer JWT and how to request an access token.
- [Concepts](https://developer.esw.com/inventory/inventory-api/concepts.md): Core concepts for the Inventory API: Available-to-Sell quantities, delivery-country availability, and choosing between GET and POST.
- [Available-to-Sell (ATS)](https://developer.esw.com/inventory/inventory-api/concepts/available-to-sell-ats.md): What Available-to-Sell (ATS) means, which inventory controls affect it, and how it differs from physical On Hand stock.
- [Delivery-Country Availability](https://developer.esw.com/inventory/inventory-api/concepts/delivery-country-availability.md): How supplying a delivery country on the POST endpoint determines the inventory applicable to a shopper's market.
- [Decision Tables](https://developer.esw.com/inventory/inventory-api/concepts/decision-tables.md): Decision tables for choosing between the GET and POST Inventory Availability endpoints.
- [API Methods](https://developer.esw.com/inventory/inventory-api/api-methods.md): Reference for the two Inventory API methods: GET and POST Inventory Availability.
- [Get Inventory Availability](https://developer.esw.com/inventory/inventory-api/api-methods/get-inventory-availability.md): Retrieve current Available-to-Sell (ATS) quantities for all applicable SKUs.
- [Get Inventory Availability for SKUs](https://developer.esw.com/inventory/inventory-api/api-methods/get-inventory-availability-for-skus.md): Retrieve Available-to-Sell (ATS) quantities for a specified list of SKUs, optionally for a shopper's delivery country.
- [Use Cases](https://developer.esw.com/inventory/inventory-api/use-cases.md): Four end-to-end scenarios showing how to use the Inventory API to keep availability in sync, check selected SKUs for a delivery market, and handle failures safely.
- [Response Codes](https://developer.esw.com/inventory/inventory-api/response-codes.md): HTTP response codes returned by the Inventory API, the error body schemas, and how to handle each response.
- [FAQs](https://developer.esw.com/inventory/inventory-api/faqs.md): Answers to common questions about the Inventory API, Available-to-Sell quantities, delivery-country behavior, and error handling.


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