How to keep referral information until user signup

Question

I would like to add referral program to my website. The user is taken from some other page to my homepage with referral url parameter like:

www.example.com?referral=refCode

The thing is, the only time I care about the referral code is at the signup page.

www.example.com/signup

Is there a way to retain the referral code through user journey on my website?

Answer 1

I solved the issue using cookies. Spring Boot provides easy access to cookie operations as described for example in this article.

When an user reaches my home page, I check for the referral parameter and if it exists, I store it in the cookie. I set cookie expiry date for 14 days for example. In the POST controller for the sign-up, I check their cookie and if it contains the referral info, I store it in the DB for the user.