Need Help to hide Backlinks to Search Engines

Ok I ll try to explain myself,

I need to create 3 back links on my site, this back links will direct customers to the checkout page of the affiliate program I’m working with. I need to find a way to hide this backlinks to the Search engines I do not want crawlers to read their codes or follow them to the checkout page. I could use the <a rel=“nofollow,noindex” but is not reliable and I must find a way to get customers to the checkout page hiding links to the Search engines. I also though about sending them to another sites page that contains backlinks to the checkout page but still crawlers will follow both links.

I hope someone understands what I’m trying to do and helps me