Invite Member Badges

Hello everyone,

I was just wondering out of curiosity, how can one achieve the below badges ?

Badges

Promoter badge on The freeCodeCamp Forum
Campaigner badge on The freeCodeCamp Forum
Champion badge on The freeCodeCamp Forum

I failed to find a referral link to provide.
(It is obvious that i could just recommend them to join by sending them the main link to FCC but that won’t reward the badge which is the whole point of that topic :smiley: )

Thank you very much for your time in advance.