I'm developing a referral system for my website, and the way it works now is to generate an unique URL like `www.example.net/public/referral/UNIQUE_URL`. This page is just a normal registry page like the one found in `www.example.net/public/registry`, but with the text "You were referred by: NAME_LASTNAME_OF_USER". Example:

**Registry page** `www.example.net/public/registry`

> *name*:_________
> 
> *last-name*:_________
> 
> *email*:______
> 
> *password*:______
> 

**Referral page** `www.example.net/public/referral/UNIQUE_URL`

> *name*:_________
> 
> *last-name*:_________
> 
> *email*:______
> 
> *password*:______
> 
> *You were referred by: NAME_LASTNAME_OF_USER*

How is this going to affect the SEO of the site? It will be better to use the same registry URL with a parameter? O this parameter, imagine `www.example.net/public/registry/UNIQUE_URL`, will also affect the SEO?