Number pad side buttons on Mac

I am considering purchasing a “gaming” mouse for my Mac with 12 side buttons and I would like to map those side buttons (buttons 1-9) to press the corresponding numbers on a keyboard. I’ve found 3 or 4 different programs that say they can do this for gestures on a trackpad. Is there anything available that can do this?

Question by MrPlum111 on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.