Add update or remove WooCommerce shipping order items

To add or update shipping items use the following:

$order_id = 2343;$order    = wc_get_order($order_id);$cost     = 10;$items    = (array) $order->get_items('shipping');$country  = $order->get_shipping_country();// Set the array for tax calculations$calculate_tax_for = array(    'country' => $country_code,    'state' => '', // Can be set (optional)    'postcode' => '', // Can be set (optional)    'city' => '', // Can be set (optional));if ( sizeof( $items ) == 0 ) {    $item  = new WC_Order_Item_Shipping();    $items = array($item);    $new_item = true;}// Loop through shipping itemsforeach ( $items as $item ) {    $item->set_method_title( __("Amazon shipping rate") );    $item->set_method_id( "amazon_flat_rate:17" ); // set an existing Shipping method rate ID    $item->set_total( $cost ); // (optional)    $item->calculate_taxes( $calculate_tax_for ); // Calculate taxes    if( isset($new_item) && $new_item ) {        $order->add_item( $item );    } else {        $item->save()    }}$order->calculate_totals();

It should better work…

To remove shipping items use te following:

$order_id = 2343;$order    = wc_get_order($order_id);$items    = (array) $order->get_items('shipping');if ( sizeof( $items ) > 0 ) {    // Loop through shipping items    foreach ( $items as $item_id => $item ) {        $order->remove_item( $item_id );    }    $order->calculate_totals();}

Related: Add a shipping to an order programmatically in Woocommerce 3

The WC_Order_Item_Shipping object can be added to an order using either of 2 methods.

1. WC_ORDER->add_shipping( WC_Order_Item_Shipping ) This is deprecated in WooCommerce V3.
2. WC_ORDER->add_item( WC_Order_Item_Shipping )

If you need to persist this change on the database then use WC_ORDER->save();

References: woocommerce.github.io.../#add_shipping woocommerce.github.io.../#add_item