I only see the ability to see a coupon when you go to the cart but not if you go directly to checkout. This is is kind of crazy as most folks will go directly to checkout when buying one item. How do you make the coupon code option show up on the checkout without looking at the cart?
EShop support the coupon option at the step 5 of checkout page. What's version of EShop that you are using? Also, please go to EShop -> System -> Configuration -> Option tab and make sure that you have already enabled coupon at checkout there.