How to get Seller Name from Amazon in ItemSearch using Amazon Product API

How can I get the Seller name using the Amazon API in ASP.NET? Which response group do I need to use, and what kind of parameters are necessary for that?

Solution

If I understand you correctly, you want to get the seller name of an offer listing. To do this you need to use the OfferFull response group as well as the MerchantId parameter set to All and the Condition parameter set to All. If you don't set the MerchantId you will only get Amazon listings and if you don't set the Condition parameter you will only get New listings.

Request:

http://ecs.amazonaws.com/onca/xml?
Service=AWSECommerceService&
AWSAccessKeyId=[AWS Access Key ID]&
Operation=ItemLookup&
ItemId=B00008OE6I&
ResponseGroup=OfferFull&                 <- important
MerchantId=All&                          <- important
Condition=All&                           <- important
&Timestamp=[YYYY-MM-DDThh:mm:ssZ]
&Signature=[Request Signature]

In your response you will need to look at the Items > Item > Offers > Offer > Merchant > Name node.

<Items>
    ...
    <Item>
        ...
        <Offers>
            <TotalOffers>148</TotalOffers>
            <TotalOfferPages>15</TotalOfferPages>
            <Offer>
                <Merchant>
                    <MerchantId>[Merchant Id]</MerchantId>
                    <Name>[Merchant Name]</Name>
                    ...
                </Merchant>
             ...
            </Offer>
       ...