We are a Shopify agency. we will help you to disable the COD.
if you are looking to get the solution please contact us.
@LAZAPARIS thanks, we will help you to restrict the COD for the country-wise Restriction.
Unfortunately it's not possible to disable COD for specific countries. Payment methods in Shopify are global, so if you enable a payment method it will be available for every country where your customers checkout.
You did the right thing by adding a note telling your customers that COD is available only in a few countries, unfortunately you will have to cancel all orders placed with COD in the countries you don't support.
I suggest you try to be more aggressive in the messaging, for example say clearly that COD is available only in countries X Y Z and all orders from different countries will be canceled.
Let me know if this helps!