How to programatically set the shipping amount in WooCommerce

Question

I am creating a Wordpress plugin that handles the shipping and delivery for WooCommerce.

I want to simply tell my WooCommerce cart (or order), this is what the shipping amount is.

I have tried directly setting WC()->cart->shipping_amount = $amount;,
and also doing ->add_fee( $shippingServiceName, $amount );
in both cases the shipping_amount on the cart remains at 0.

How do I set the shipping amount?

Answer 1

I ended up setting it directly on the order instead of on the cart;
Here is the method I created and used in my "complete purchase" processing :

function addShippingToOrder( $order, $shipping_amount, $shipping_name ) {

        $shipping_tax = array(); 
        $shipping_rate = new WC_Shipping_Rate( '', $shipping_name, 
                                      $shipping_amount, $shipping_tax, 
                                      'custom_shipping_method' );
        $order->add_shipping($shipping_rate);

}

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I also needed to save the shipping amount when I was in the cart logic, and then retrieve it when I was in the order logic, and I did that with a custom cart "session" variable :
WC()->session->set( 'my_custom_shipping_amount', $amt ); and
WC()->session->get( 'my_custom_shipping_amount' )

---

This is a very simple answer, but it took me the longest time to figure out - I even ended up creating a plugin especially for debugging changes to WC_Orders : WooCommerce Order Debugger Plugin

Answer 2

Try following code

add_filter('woocommerce_package_rates', 'apply_static_rate', 10, 2);
function apply_static_rate($rates, $package)
    {                   
        foreach($rates as $key => $value) {
            $rates[$key]->cost  =   150;    // your amount                  

        }
        return $rates;
}