Change shipping method programmatically from existing WooCommerce order

Question

My customers ar buying subscriptions through my woocommerce website. They receive the products each month but somethimes they want to change the shipping method. I don't find doc for doing it through php.

I could change the values in post_meta, woocommerce_order_items and woocommerce_order_itemmeta but it's not a durable solution.

LoicTheAztec · Accepted Answer · 2020-05-21T16:11:17.437

Here is the way to change an order "shipping" item programmatically for a new shipping method id (slug) to be defined:

// Here set your shipping method ID replacement
$new_method_id ='flat_rate';

// Get the the WC_Order Object from an order ID (optional)
$order = wc_get_order( $order_id );

// Array for tax calculations
$calculate_tax_for = array(
    'country'  => $order->get_shipping_country(),
    'state'    => $order->get_shipping_state(), // (optional value)
    'postcode' => $order->get_shipping_postcode(), // (optional value)
    'city'     => $order->get_shipping_city(), // (optional value)
);

$changed = false; // Initializing

// Loop through order shipping items
foreach( $order->get_items( 'shipping' ) as $item_id => $item ){

    // Retrieve the customer shipping zone
    $shipping_zone = WC_Shipping_Zones::get_zone_by( 'instance_id', $item->get_instance_id() );

    // Get an array of available shipping methods for the current shipping zone
    $shipping_methods = $shipping_zone->get_shipping_methods();

    // Loop through available shipping methods
    foreach ( $shipping_methods as $instance_id => $shipping_method ) {

        // Targeting specific shipping method
        if( $shipping_method->is_enabled() && $shipping_method->id === $new_method_id ) {

            // Set an existing shipping method for customer zone
            $item->set_method_title( $shipping_method->get_title() );
            $item->set_method_id( $shipping_method->get_rate_id() ); // set an existing Shipping method rate ID
            $item->set_total( $shipping_method->cost );

            $item->calculate_taxes( $calculate_tax_for );
            $item->save();

            $changed = true;
            break; // stop the loop
        }
    }
}

if ( $changed ) {
    // Calculate totals and save
    $order->calculate_totals(); // the save() method is included
}

Tested and works

Related threads:

Change shipping method programmatically from existing WooCommerce order

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