Affiliate Marketing is one of the best ways to generate money from websites or blogs. However, when you have several websites to manege, things get complicated and you just can't keep up with adding/updating/removing affiliate links. I built a solution for this: Wp Auto Affiliate Links. It is a free wordpress plugin that was already downloaded over 60,000 times. Downlad here: https://wordpress.org/plugins/wp-auto-affiliate-links/