Search for a product in RetailCRM

Use the storeProducts method with three parameters:

1. Filter — array (product ID, price, vendor, groups, tags, segments, etc.)
2. page — page number (pagination). Up to 20 products per request.
3. limit — number of products per request (max 20).

Search by site product ID (externalId)

$products = $modRetailCrm->request->storeProducts(array('externalId' => 100), 1, 20);

More filter options: RetailCRM API docs