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'rows'=> array(array(  "PRODUCT_ID"=> $_POST['Id'], 
     "PRICE"=>str_replace($chars, '', $_POST['Price']),
     "QUANTITY"=>1,
     ))

$queryUrl = 'https://xxxx/rest/1/yyyyyyy/crm.lead.productrows.set.json';
 $queryData = http_build_query(array(
 'id' => $result['result'],
 'rows'=> array(
     "PRODUCT_ID"=> $_POST['Id'], 
     "PRICE"=>str_replace($chars, '', $_POST['Price']),
     "QUANTITY"=>1,
     )
 ));
$curl = curl_init();
 curl_setopt_array($curl, array(
 CURLOPT_SSL_VERIFYPEER => 0,
 CURLOPT_POST => 1,
 CURLOPT_HEADER => 0,
 CURLOPT_RETURNTRANSFER => 1,
 CURLOPT_URL => $queryUrl,
 CURLOPT_POSTFIELDS => $queryData,
 ));

 $result = curl_exec($curl);
 curl_close($curl);