How can I provide a custom order shipping value?

Question

I'm trying to create a plugin to allow shipping cost based on ranges of post codes. The post codes are hard-coded into the plugin. Due to my lack of experience developing for ExpressionEngine I'm unable to get the plugin to do anything.

Note that the cart only has one shipping option; the user shouldn't need to or be able to select a shipping option; this should be applied automatically based on their shipping post code.

Plugin: https://gist.github.com/anonymous/86838c02028faabfb404

Answer 1

The problem is that you are trying to edit the order directly.

Instead, your extension should implement the store_order_shipping_methods hook to return your custom shipping rate, as the official Store shipping extensions do.

Inside the extension file, your hook method should look something like this:

public function shipping_methods($order, array $methods)
{
    if (ee()->extensions->last_call !== false) {
        $methods = ee()->extensions->last_call;
    }

    // implement your own shipping logic here
    if ($order->shipping_postcode == '12345') {

        // add a custom shipping method
        $option = new Store\Model\OrderShippingMethod;
        $option->id = 'custom';
        $option->name = 'My Custom Shipping Method';
        $option->amount = 10.00;
        $option->class = __CLASS__;

        $methods[$option->id] = $option;
    }

    return $methods;
}