WooCommerce is the most popular plugin in use to power WordPress store fronts and now you can show your customers that your site is secure while they checkout. It is a must that if you are accepting credit cards on your site, you need to have a SSL Certificate installed and setup. Take this a step further and let your customers know that the page they are entering their credit card information on is 100% secure.
This plugin will let you:
All displays will be directly under the PLACE ORDER button on your WooCommerce checkout page.
WooCommerce > Settings > SSL Seal Tab
There is NO BETTER WAY to show your customers how secure your WooCommerce site is.