Advanced Order Editor for WooCommerce

Advanced Order Editor for WooCommerce by BerryPress adds Paid date, Completed date and Payment method fields in the order edit screen (WooCommerce > Orders > Edit order), in the General section below Date created. You can set or change the paid date and completed date manually, or leave them empty. The payment method dropdown lists all enabled gateways so you can correct or set the method used for the order.

The fields are not displayed when editing a subscription (WooCommerce Subscriptions); only regular orders show them.