Hi @greezball.  Currently, there is no mechanism in Square to allow this.  While it IS possible with Square Invoices, that’s overkill, probably, for your purposes.  You could head over to the Ideate Board and submit a feature request to the Square POS team, but that would just get the ball rolling on evaluation and a decision-making process.  It will not be a quick solution for you.  However, with the tools that are in place it is possible we could help you develop a solution to combat employee dishonesty and inattention to detail.

Could you explain in some detail what specific problems you are trying to fix?  What does your “fake receipt” problem look like?  What about your “duplicate receipts” problem?  Square has tools to require manager overrides for sensitive things like voiding transactions, applying unauthorized discounts, etc.  Unless you have really unique problems I’m pretty sure that a combination of those would be a better solution for you than just having a sequential receipt number.

Thanks,