Amazon Advertising API get Node's products

Question

I'm creating e-commerce shop with Amazon API integration. The problem I faced with is I cannot get items from specific node. So I've tried many ways to do that, last one was something like this:

$fields = array();
$fields['AssociateTag'] = "ItemSearch";
$fields['Condition'] = 'All';
$fields['Operation'] = 'ItemSearch';
$fields['Version'] = '2013-08-01';
$fields['BrowseNode'] = $catId;
$fields['ResponseGroup'] = "Images,ItemAttributes,Offers";
$fields['Service'] = 'AWSECommerceService';
$fields['Timestamp'] = gmdate('Y-m-d\TH:i:s\Z');
$fields['AWSAccessKeyId'] = $this->accessKey;

After that call I have the output:

public 'Items' => 
    object(SimpleXMLElement)[150]
      public 'Request' => 
        object(SimpleXMLElement)[139]
          public 'IsValid' => string 'True' (length=4)
          public 'ItemSearchRequest' => 
            object(SimpleXMLElement)[138]
              public 'BrowseNode' => string '1289481011' (length=10)
              public 'Condition' => string 'All' (length=3)
              public 'ResponseGroup' => 
                array (size=3)
                  0 => string 'Images' (length=6)
                  1 => string 'ItemAttributes' (length=14)
                  2 => string 'Offers' (length=6)

So I can see my request, but no items were returned to me.

By the way, ItemLookup, ItemSearch with keywords and BrowseNode operations work just fine. What can I do to get items from node with spicific ID without using keywords?

Answer 1

I figured out what happened. I didn't set SearchIndex when I point BrowseNode ID. So there was no result.