I want to make some changes if the chosen payment method is COD. On existing WC_Order i have used
($order->payment_method_title == 'Cash On Delivery' ? ... : ... );
to retrieve the title.
But i would like to check against the id (cod) because the title string gets translated to different languages which doesn't make it a good solution.
Is there a way to retrieve the id on a WC_Order in woocommerce?
The post meta key for the payment method ID is simply _payment_method
So if $order->payment_method
doesn't have the magic methods in place to get that automatically, you could retrieve the post meta using traditional WordPress
get_post_meta( $order->id, '_payment_method', true );
Update for WooCommerce 3.0
$order->get_payment_method();
If you need the payment gateway object itself you can use the wc_get_payment_gateway_by_order
function.
$payment_gateway = wc_get_payment_gateway_by_order( $order );