My question involves a banking matter in the State of: New Mexico

I work as a bartender for a major food company. My question is as follows: If im working my shift and I pay for my food with my own credit card and decide to tip myself on my card is this fraudulent? It's my card. My tip. My money. I have money in the account. Now i know the first thing you may think is that it says I can't do this in the company policy handbook. I have devoured our handbook and there is not a think in relevance to this or anything close. I did tip myself on my own card and my manager is being less then happy right now. So if anyone has any sort of tiny bit of info on this please let me know thank you.