Magento 2 Payment Charge Extension by CynoInfotech helps store admins to add payment method processing fee to product order subtotal. Store owners can set a payment method processing fee from the backend on any of the selected payment methods as a fixed price or as a percentage price. payment charge Magento 2 fraud may involve a scenario where a merchant using the Magento 2 e-commerce platform applies a hidden or undisclosed additional charge during the checkout process.