WooCommerce order IDs should be database IDs instead of display IDs

[Resonious]

The problem

WC merchants can change the format of order numbers. Unfortunately, when they do so, it breaks this plugin's ability to process webhooks for old orders.

In short, this plugin is using order display IDs to associate KOMOJU payments with WC orders. It should use database IDs instead if possible.

Possible fix

This is where we save the order ID on the KOMOJU session

komoju-woocommerce/class-wc-gateway-komoju.php

Line 200 in 64ee617

'woocommerce_order_id' => $order->get_order_number(),

This is where we use the saved order ID

komoju-woocommerce/includes/class-wc-gateway-komoju-response.php

Line 47 in dff1b86

$order = wc_get_order($session->metadata->woocommerce_order_id);

I think we can change the get_order_number to be get_id. The wc_get_order function can probably stay the same. In the docs, it says you can pass "Post object or post ID of the order".