Validation of the authentication token in API request failed / C# SDK
I am attempting to use the .NET SDK to connect to ebay and add an item, but I'm receiving the following error: Validation of the authentication token in API request failed I'm using the code from the SDK AddItem example, which I've modified with the code I wrote for requesting an OAuth access token. I've successfully gained and refreshed the tokens, but cannot seem to use them in an API call. I've modified the credientials section of the code as follows: ApiCredential apiCredential = new ApiCredential(); apiCredential.eBayToken = ebayToken.AccessToken; // refreshed oauth access token apiCredential.ApiAccount.Application = "my app code"; apiCredential.ApiAccount.Certificate = "my app certificate"; apiCredential.ApiAccount.Developer = "my developer code"; apiContext.ApiCredential = apiCredential; Please advise. There doesnt seem to be a great deal of documentation for using the ebay API in a multi user environment.