$arParams = array(
    "DELIVERY_ADDRESS" => "Delivery Address", //optional
    "DELIVERY_ADDRESS2" => "Delivery Address", //optional
    "DELIVERY_ZIPCODE" => "12345", //optional
    "DELIVERY_CITY" => "City", //optional
    "DELIVERY_STATE" => "State / Dept.", //optional
    "DELIVERY_COUNTRYCODE" => "TR", //optional
    
);

foreach ($products as $k => $v) {
    
   
 $temp = array (
            "ORDER_PNAME[$k]" => $v['product'],
            "ORDER_PCODE[$k]" => $v['product_code'],
            "ORDER_PINFO[$k]" => "",
            "ORDER_PRICE[$k]" => $v['price'],
            "ORDER_QTY[$k]" => $v['amount'],
        ); 
array_push($arParams, $temp);
}