All subscribers to Digital Pigeon are able to refer others by clicking on the "Referral Discounts" link located in the header. Provided are options for sending the link to people they know. Every referral that results in a paid subscription will allocate 10% off their own subscription and 10% off the recipient subscription too. The link must be used in order to set up the discounts on both ends correctly.
Once a successful referral is set up both parties can expect to see a discounted rate applied to their next invoice under the "View past payments" function in "Manage > Subscription" within Digital Pigeon.