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Add a surcharge to cart and checkout – uses fees API

Add code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Code snippets plugin. Avoid adding custom code directly to your parent theme’s functions.php file as this will be wiped entirely when you update the theme.

Add a percentage based surcharge to all transactions 

Add a standard $ value surcharge to all transactions

Add a surcharge based on the delivery country