Koop Referral Code & Recommendation page. Welcome! Enjoy and share your Koop referral links on this dedicated page so your friends and others can benefit from your support. And then share all your referrals in your own free page. Super-fan of Koop? Make sure you give a thumbs-up recommendation. Enhance your referral network by connecting to others - influence friends & others and make an easy passive referral income. So get started and share your Koop referral now and turn your thumbs-up into a referral high-5!