[LEGACY] Add A Patient Referral

[FOR LEGACY] If a patient has been referred by someone else, here's how to add this to their profile.

Add the referral to a patient's profile before the visit so that the referral credit is available when the patient comes in. You will find a "Referrals" section in the patient profile to do so. The referral credit will become available only once the referred person comes in for their visit and they have a paid checkout in a service visit.