This is a WooCommerce plugin, that allows you adding an additional checkout fee for each of your payment methods.

ByteJutsu

ByteJutsu Fixed Order Fee for WooCommerce

This plugin adds a customizable fixed fee to WooCommerce orders with an easy-to-configure amount and label.

Ivan Popov

The Payment Method Checkout Fee plugin for WooCommerce enables you to apply an additional percentage or fixed fee to each payment and shipping method. You can easily configure the settings under the “Settings” menu in WordPress, titled ‘Checkout Fee’.
You can find the settings under “Settings” menu in WordPress, titled ‘Checkout Fee’.
You have an option to choose which payment methods should have the additional fee by ticking Enable.
Then you can add the percent or fixed fee you desire to be added as an additional fee for the selected method.
Features:
Select which payment methods should have an additional fee. 
Set a custom percentage or fixed amount as the checkout fee. 
New settings are integrated into the WooCommerce Settings tab for a seamless experience.

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