If you'd like to refer a business you know to signup for a Vault account you can send them your unique referral link.
Steps to find your unique link:
Navigate to settings
Click on Referrals
You will find the link at the bottom.
The payment is made on the 5th of each month following once both businesses have met the spending threshold.
If two or more businesses have the same director or owner they would not be eligible for the referral bonus.