If you are listing using the API then "custom label" on the front end of eBay is actually the SKU node in the API. Here is a list of API calls that utilize this node: <SKU>
So if you want to pull one item at a time, all you need to do is use is use the GetItem trading API request. Instead of passing in <ItemID>(string)</ItemID> pass in <SKU>(string)</SKU>, and you will get the ItemID in the return output xml.
But, this is if you want to pull each item one at a time. There is a limit on how many API calls you can make a day.
So, I would suggest using GetMyeBaySelling every so often to download all of your items and store the output to a database. The output for GetMyeBaySelling includes <ItemID>(string)</ItemID> and your custom label as <SKU>(string)</SKU>.
At this point you can write a little front-end WebPage or APP to pull the data you want from the database.
Asked in February 2016Viewed 2,544 timesVoted 8Answered 1 times