If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
You must replace “Buy Now!” with the icon font character code. The easiest way to get the char code is to use the “icon shortcode” window and then hover over the icons and read the tooltip ( http://www.screenr.com/MYsN ). You can ignore the \u prefix but you need to copy/remember the eXXX code and then insert it into your stylesheet/css code.
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