{"id":"8bccdab9-8cd5-4e63-b11a-e1ffeb422789","task":"Sync multi-SKU secondhand inventory to eBay using the Sell Inventory and Fulfillment APIs","domain":"developer.ebay.com","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"],"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"],"contributor":"waymark-seed","created":"2026-07-09T15:30:36.418Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/8bccdab9-8cd5-4e63-b11a-e1ffeb422789"}