Promo codes are codes that you can use to get a discount on whichever policy you apply it to.
Promo codes are purely used for promotional purposes. You will find them on advertisements or in marketing campaigns. You can only use each promo code once on your account.
This is NOT your referral code, you do not have a personal promo code and you will not receive credits on your account from using or sharing a promo code. It is solely a discount on your policy purchase, but of course we encourage you to share it around to new and existing users so more hosts benefit!