I am not able to add products in sandbox, When I click create template button by going selling link it shows attached error.
Please use the Trading API or Inventory API to list the item on sandbox. If you wan to use Trading API, you can use the following calls for listing the item:
For 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.
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.
3. After getting offerID, publish the offer by PublishOffer Call. Please go through the link given below to know more about call.
Please refer to the guide mentioned in below, to know more about working with the Inventory API.
Use the URL http://sandbox.ebay.com/itm/ENTER_ITEM_ID_HERE , to see the item view page on sandbox UI.
eBay Developer Support
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