How to get custom shipping module costs through to checkout?

[s_mack]

The wiki seems to be vacant on this issue from what I can find, but if there is a guide... please provide a link.

I'm trying to make a custom shipping module. I started with various built in one but couldn't figure out how to get multiple shipping options. Then I emulated some of the add-on modules that have that (DHL, UPS) and managed to get multiple options to show... but choosing an option and clicking continue results in a shipping cost of zero, even though they were displayed correctly in the shipping page.

What's the trick?

Here's an example quote function.

        function quote($method = '') {
            global $order, $shipping_weight, $shipping_num_boxes, $total_weight, $boxcount, $handling_cp, $cart;
             
            $methods = array();
            for ($x = 0; $x <= 10; $x++) {
              $methods[] = array('id' => 'ID' . $x,
                     'title' => 'Title' . $x,
                     'cost' => $x,
                     'insurance' => $x*.1,
                    );
            }
                $this->quotes = array('id' => $this->code,
                    'module' => MODULE_SHIPPING_SFC_TEXT_TITLE,
                    'methods' => $methods);
                if ($this->tax_class > 0) {
                    $this->quotes['tax'] = zen_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
                }

            return $this->quotes;
        }

It works and I'm shown 10 options priced $1 to $10... but choosing any shows zero next page.

Thanks.