Customize Smart Coupons for WooCommerce (WordPress) for our Customized Website

We would like to add the ability for customers to purchase gift certificates to our eCommerce site, which runs on WooCommerce on WordPress. We purchased Smart Coupons, which allows this functionality, but there are a number of minor modifications we would like to make, both in terms of how the plugin looks on our site and also possible minor changes to its functionality. You will need to be excellent at PHP and also have good design skills, so that we can make this look very nice. We will pay 100% upon completion.