Add fee to checkout for all payment gateways

Here’s a quick PHP code for adding a fee to the checkout for each payment or for a certain payment gateway. Please keep in mind that adding checkout fees to certain payment gateways, such as PayPal, is currently against their Terms of Service, so double-check beforehand. This Snippet must be added into your child theme’s functions.php file. https://www.codeithub.com/add-fee-to-checkout-for-all-payment-gateways/