$item["CalcMethod"] = "N";
// No Charge
$item["refCode"] = "test_item_3";
$item["quantity"] = 1;
// Uncomment to add this item to this shipment
// $items[] = $item;
//************************************************
// End Example Items
//************************************************
//************************************************
// Add Item Data from Item Array to API Object
//************************************************
foreach ($items as $val) {
    $calcCodes = array('C', 'CI');
    if (in_array($val["CalcMethod"], $calcCodes)) {
        $shipAPI->addItemCalc($val["refCode"], $val["quantity"], $val["weight"], $val['weightUOM'], $val["length"], $val["width"], $val["height"], $val["dimUOM"], $val["value"], $val["packMethod"], $val["lotSize"], $val["CalcMethod"]);
        if (isset($val["originCode"])) {
            $shipAPI->addItemOriginCode($val["originCode"]);
        }
        if (isset($val["odServices"])) {
            $shipAPI->addItemOnDemandServices($val["odServices"]);
        }
        if (isset($val["suppHandlingCode"])) {
            $shipAPI->addItemSuppHandlingCode($val["suppHandlingCode"]);
        }
        if (isset($val["suppHandlingFee"])) {
            $shipAPI->addItemHandlingFee($val["suppHandlingFee"]);
        }
        if (isset($val["specCarrierSvcs"])) {
            $shipAPI->addItemSpecialCarrierServices($val["specCarrierSvcs"]);
        }