In Texas gamerooms that give cash as winnings get shut down. I hope to promote my bussiness by asking people that recieve a certificate from me,use percentage before recieving cash back. Want to be legal on this issue.
Then consult with an experienced business lawyer who is in possession of all of the material facts not just a paragraph of vagueness on a public website. As a general rule you cannot redeem certificates for cash without serious legal consequences if they were not purchased for the full value of the certificate.
DISCLAIMER: This is not specific legal advice and does not establish an attorney/client relationship.