What is the difference between FindPopularItems and FindPopularSearches API calls for eBay Shopping Web Service?

Which URL (endpoint) will be used to post requests to Feedback API?

'ack' indicates whether there are any errors or warnings associated with the processing of the request. Which of the following are the applicable values for the ack output field that can be returned by the web service when you make a Merchandising API call?

How many DSR query requests are allowed per seller per day?

Which request and response formats are supported by the Merchandising API?

Which will take the precedence if you specify both the categoryId or the ItemId when you make a getRelatedCategoryItems API call?

What will be the datatype for the ChannelID parameter when you make a GetPublicAlerts API call of eBay Client Alerts API?

How many records will we get if we make the following API call? http://open.api.ebay.com/shopping?callname=FindPopularItems&responseencoding=XML&appid=YourAppIDHere&siteid=0&version=531&QueryKeywords=harry

What is the data type of the Item.AutoPay input field in a ReviseFixedPriceItem API call for eBay Trading Web Service?

Which datatype is not supported by Trading API ?

Which one causes token expiration to occur?