referrals not work IPB 4.1.15

[krikri89]

Hello i tried many times use this system "referrals" but not work 

When i add link in url not show nothing and i tried use link for register and for buy in store but on refer not show nothing

 

seems as this option is broke and not add % every purchase

 

somone can help or maybe know if with this IPB version is broke?

 

thanks