Gift Cards for WooCommerce is a plugin that I created which allows someone to manage and sell gift certificates from their Woocommerce website. You can sell them to your visitors, as well as accept payments through any of your other payment gateways. It will then allow your customers to purchase gift card on the site that will be created.
I also created premium upgrades of the plugins and offer them on my site wp-ronin.com. I am also able to create additional features in a case by case basis. Currently I am working on an upgrade to the plugin that will allow for some cool new features that many people are looking to get.