(Help Needed) Setting up affilate tracking,

Hi,

I just wanted to know if there is a way to set up a free affilate tracking. We are partners with a company and they said we need to set up an affilate tarcking to stay in partnership witht hem, But all affilate softwares are expensive, as its a new business and not making any money I thought maybe you can help poin me in the right direction please?

I am hoping to find one thats free please, I am not getting a lot of traffic so it just needs to be basic, Right now I am using YITH affilate the free wordpress plugin to allow affilate to sign up on our site,

Any help would be appreciated thank you.

ps if this does not belong here than please move it. sorry in advance