Add a surcharge to cart and checkout – uses fees API
- Add a basic surcharge to all transactions: https://gist.github.com/b98e50e29acbd8f7b13cac4217692810
- Add a surcharge based on the delivery country: https://gist.github.com/47c3a4f6fc0d9efa672922ac1b3e7fd2
Customize the WooCommerce breadcrumb