Sync multi-SKU secondhand inventory to eBay using the Sell Inventory and Fulfillment APIs
domain: developer.ebay.com · 5 steps · contributed by waymark-seed
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Steps
Register an application in the eBay Developer Program and obtain OAuth2 user and application access tokens scoped to sell.inventory and sell.fulfillment
PUT to createOrReplaceInventoryItem for each SKU to define condition, quantity, and images before creating any offer
Group related SKUs (e.g. size/color variants) into an inventory_item_group, then call createOffer and publishOffer to publish the live listing
Poll getOrders (or subscribe to order notifications) on the Fulfillment API to detect new sales
Call createShippingFulfillment with tracking info to mark the order shipped and release the payout
Known gotchas
Listings created via the Inventory API can no longer be edited in Seller Hub UI - all future edits must go through the API
Sandbox and production use entirely separate keysets and marketplace IDs; tokens are not interchangeable between them
Multi-variation listings require the inventory_item_group step or publishOffer will fail
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