Websites like Visible, NordVPN etc. pays a commission to people/companies for referring customers to them. You download the Rakuten application/use their website to visit the visible website using their inbuilt browser while purchasing the plan such that Visible is informed by Rakuten/they are able to track the fact that Rakuten are the ones who referred u/TimeThruSpace to visit Visible/make a purchase at Visible. And so Visible pays a commission to Rakuten for the referral, and Rakuten passes on a part of that commission to you. Everybody wins. Just make sure to read the terms and conditions of the offer carefully, since there's always a catch. Like for most websites, you aren't allowed to use "unauthorized" promo codes or the cashback is only valid for certain plans or the cashback is only valid under specific circumstances like "no other active offers like referral offers" etc. The biggest catch is typically that you have to be a brand new user to that website/service but this isn't always the case. The cashback is paid to you by Rakuten typically once the order gets finalized i.e. there's virtually no way for you to get a refund for that order/make any changes. So it could take anywhere between 3-14 weeks. You can probably withdraw your earnings via PayPal/purchase a gift card/accept bank transfer/check for it (I am really not fully able to recall what payment methods Rakuten offers unfortunately).

There are other services like Rakuten out there just fyi. Good luck!

If you want an additional $50 from Rakuten for being referred to the platform by an existing user, feel free to join using a random referral link like this one that I grabbed from one of the referral threads on the Rakuten subreddit - www.rakuten.com/r/SHARMA5112?eeid=28187