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Well there are probably modules that do what you desire however, with the current setup it can also be achieved. If you setup a Shipping carrier,  lets just call it "Cash on Delivery Shipping"  and assign it to all Paints that require "cash on delivery". For those paints, this is the only option. For all other Products all Shipping methods are available. Now go into Payment Preferences and assign "Cash on Delivery and/or any payment option you want" to the newly created carrier. Voila, as soon as someone orders one of your special paints, Cash on delivery Shipping will be the only Option available which requires to be paid upfront. If someone doesn't order any special paints, he is still able to choose the Cash on delivery method but its clear to him that he will have to pay when delivered.  

Well there are probably modules that do what you desire however, with the current setup it can also be achieved. If you setup a Shipping carrier,  lets just call it "Cash on Delivery Shipping"  and assign it to all Paints that require "cash on delivery". For those paints, this is the only option. For all other Products all Shipping methods are available. Now go into Payment Preferences and assign "Cash on Delivery" as only payment option to the newly created carrier. Voila, as soon as someone orders one of your special paints, Cash on delivery Shipping will be the only Option available which requires to be paid upfront. If someone doesn't order any special paints, he is still able to choose the Cash on delivery method but its clear to him that he will have to pay when delivered.  

Well there are probably modules that do what you desire however, with the current setup it can also be achieved. If you setup a Shipping carrier,  lets just call it "Cash on Delivery Shipping"  and assign it to all Paints that require "cash on delivery". For those paints, this is the only option. For all other Products all Shipping methods are available. Now go into Payment Preferences and assign "Cash on Delivery" as only payment option to the newly created carrier. Voila, as soon as someone orders one of your special paints, Cash on delivery Shipping will be the only Option available which requires to be paid upfront. If someone doesn't order any special paints, he is still able to choose the Cash on delivery method but its clear for him he will have to pay when delivered.  

Well there are probably modules that do what you desire however, with the current setup it can also be achieved. If you setup a Shipping carrier,  lets just call it "Cash on Delivery Shipping"  and assign it to all Paints that require "cash on delivery". For those paints, this is the only option. For all other Products all Shipping methods are available. Now go into Payment Preferences and assign the "Cash on Deilvery" as only payment option to the newly created carrier. Voila, as soon as someone orders one of your special paints, Cash on delivery Shipping will be the only Option available which requires to be paid upfront. If someone doesn't order any special paints, he is still able to choose the Cash on delivery method but its clear for him he will have to pay when delivered.