What is the referral code for Nyan Heroes?

Could you please clarify what the referral code for Nyan Heroes is? I'm interested in potentially joining the platform and was wondering if there's a specific code I can use to refer friends or receive any benefits when signing up. Additionally, if you have any insight into how the referral system works and what kind of rewards or incentives it offers, I would greatly appreciate any information you can provide. Thank you for your time and assistance.