Limit checkout amount for COD orders

New Member
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In my country, a lot still prefers to oay thru COD. We usually get 3rd party couriers to deliver our products to customers but the couriers had set a limit of $40 per COD job since the couriers will pay the us (sender) in advance and collecting from same amount from the receipient.

But even with instructions in my website customers still place orders more than $40 thru COD. How can I limit the amount so they cant checkout more than $40 worth of items if they plan to pay thru COD?