If you want to add custom total i.e custom fees to already generated order from admin this is very simple and best opencart extension for it. Also you can add c..

Restrict cash on delivery based on products for your opencart store. Also show them special message about COD on product page so they know it prior...

Price for payment method extension helps you add extra price in order totals based on the payment method selected. You can select the payment method - Opencart..

About: Store credit on order purchase helps you to give your customers some credit when they make order. Based on payment method customer will get some cred..

About:The extension helps you control payment and shipping based on customer group.You can also set up payment and shipping methods for not logged in customers...