title: Enable/disable cash-on-delivery only for some specific products
body: <p>I want to disable cash on delivery payment method option for some specific products. I want to show cash on delivery method only for specific products and need to hide other payment options.</p>
  
  <p>How can I do this?  I read
  <a href="https://stackoverflow.com/questions/14011348/disable-payment-options-only-cash-on-delivery-for-particular-product-magento">this other question</a> but it did not solve my problem.</p>