Inventory API publishOffer fails when one fulfillment policy includes, UPS Standard & Canada Post | Account, Inventory, Catalog and Compliance

retroseller186 · 2026-03-20T11:19:39.387000Z

Observed behavior:createOrReplaceInventoryItem succeedscreateOffer succeedspublishOffer failsTest results:Several packageType enums fail at publish with 25101 Invalid <ShippingPackage>Canada Post bubble mailer / box style enums fail at publish with 25020 Package dimensions exceeded maximum allowable limit for service UPS Standard CanadaThis occurs while using one fulfillment policy containing both UPS Standard Canada and Canada Post servicesIn manual listing flow, equivalent shipping choices appear possibleWhat I need from eBay:The exact supported packageType values/constraints for a single EBAY_CA listing where buyers can choose both UPS Standard Canada and Canada PostWhether one shared packageWeightAndSize.packageType can support both carriers in one fulfillment policyWhy publishOffer rejects these combinations after inventory item and offer creation succeedWhether this is expected behavior, a documentation gap, or an API defecthttps://community.ebay.com/t5/eBay-APIs-Talk-to-your-fellow/Failed-to-publish-offer-quot-Invalid-lt-ShippingPackage-gt/td-p/34603572?utm_source=chatgpt.comI attempted @river_house_books suggestion, I've gone through them all, there is no packing type that fits for both, clearly I am missing some obvious fix that for some reason has 0 documentation on the internet that I can find.Don't suggest AI solutions. SMALL_CANADA_POST_BUBBLE_MAILER 24 x 20 x 4 CM150 GWorks for both UPS and Canada Post ~ however 250G or any other combination of sizes or weights outside of that does not work. With any combination of any ENUM I brute-force tested each packageType enum against 27 package configurations:5 size groups and weights from 150g to 10000g:24x20x4 (150/200/250/300/350/500g),18x13x3 (250/300/350/400/500/650g),23x19x12 (300/500/750/1000/1500/2000g),35x25x15 (750/1000/1500/3000/5000g),35x35x15 (1000/2000/5000/10000g).Any feedback greatly appreciated

Discussions

Inventory API publishOffer fails when one fulfillment policy includes, UPS Standard & Canada Post | Account, Inventory, Catalog and Compliance | eBay Community