Who is the referral code?

Excuse me, could you please clarify what you mean by "Who is the referral code?"? As I understand, a referral code is not a person, but rather a unique sequence of characters or numbers that is used to identify a specific referral program or offer. It's typically given to a customer by a business or an individual in order to incentivize them to refer their friends or family to the business. So, perhaps you meant to ask "What is the purpose of a referral code?" or "How does a referral code work?" Could you please rephrase your question to better reflect what you're trying to ask?