I have developed the magento website called <https://tumree.com> and I needto enable COD for test product.

URL: <https://tumree.com/test-product>
I need to enable cash on delivery for above product only. There is a option for disable COD for specific product. But I need to enable for one.

I have tried writing rule in shopping cart rule. But couldn't fix the issue. Pls help me to find the solution...