Use this Wp Stealth Plugin to mask your affiliate links and landing pages.
This will keep commission thieves away from your site. Can be used on multiple sites.
You can edit your links any time you want, and redirect your traffic anywhere you wish.
There is one more point, the plugin builds links back to Your site.

Comes with Full Master Resell Rights and Bonus Reseller Page.

Master Resell Rights Terms and Conditions
[YES] Can be packaged [YES] Can be offered as a bonus
[YES] Can be sold at any price
[YES] Can be added into paid membership sites
[YES] Can put your name and website on sales page
[YES] Can convey and sell Personal Use Rights
[YES] Can convey and sell Master Resell Rights
[YES] Can convey and sell Resell Rights
[NO] Can be given away for free
[NO] Can add to free Membership Sites
[NO] Can extract the graphics for use elsewhere
[NO] Can convey and sell Private Label Rights [NO] Can Claim Copyright
IMPORTANT!