@ Can you please help me with this I'm using https://developer.ebay.com/api-docs/sell/inventory/resources/inventory_item/methods/createOrReplaceInventoryItem.

This is my question
Error Fetching Inventory Item/items in Sandbox - eBay Developer Forums

Hi @eztradesman,

Please use the Trading API or Inventory API to list the item on sandbox.

When making any API call to list the item, please specify the siteID/marketplaceID in the API request.

If you wan to use Trading API, you can use the following calls:

Ref: https://developer.ebay.com/devzone/xml/docs/Reference/eBay/StandardListingIndex.htmlFor listing an item by Inventory API you have to follow given steps :-

1. Use CreateOrReplaceInventoryItem call to create a record of an item for a SKU.

Please go through the link given below to know more about call.

Ref: https://developer.ebay.com/api-docs/sell/inventory/resources/inventory_item/methods/createOrReplaceInventoryItem

2. After that Create an offer for the same SKU by CreateOffer Call. This will give you Offer ID in response body.

Please go through the link given below to know more about call.

Ref: https://developer.ebay.com/api-docs/sell/inventory/resources/offer/methods/createOffer

3. After getting offerID, publish the offer by PublishOffer Call. Please go through the link given below to know more about call.

Ref: https://developer.ebay.com/api-docs/sell/inventory/resources/offer/methods/publishOffer

Please refer to the guide mentioned in below, to know more about working with the Inventory API.

Ref: https://developer.ebay.com/api-docs/sell/static/inventory/inventory-item-to-offer.html

Best regards ,
eBay Developer Support