Amazon Product Advertising API Developer's Manual page 215

Product Advertising API Developer Guide
Request Parameters
Name
Condition
ItemId
MerchantId
SimilarityType
SimilarityLookup
Description
Specifies an item's condition. If Condition is set to "All," a
separate set of responses is returned for each valid value
of Condition.
Type: String
Default: New
Valid Values: All | Collectible | Refurbished | Used
Specifies the item you want to look up. An ItemId is an
alphanumeric identifier assigned to an item. You can
specify up to ten ItemIds separated by commas.
Type: String
Default: None
Valid Values: ASIN
An optional parameter that can be used to filter search
results and offer listings to only include items sold by
Amazon. By default, Product Advertising API returns items
sold by various merchants including Amazon. Enter
"Amazon" to return only items sold by Amazon.
Type: String
Valid Values: Amazon
"Intersection" returns the intersection of items that are
similar to all of the ASINs specified. "Random" returns the
union of items that are similar to all of the ASINs specified.
Only ten items are returned. So, if there are more than ten
similar items found, a random selection from the group is
returned. For this reason, running the same request
multiple times can yield different results.
Type: String
Default: Intersection
Valid Value:Random
API Version 2011-08-01
208
Required
No
Yes
No
No