Is there a way to track which salesperson sold something so I could pay them a commission?

Hi. I use squarespace commerce at my small gallery/shop via POS on my iPad. I am looking for a way to track who sold something so that I can give them a commission on whatever sells when they are here working. Is there a plug in for this or a way to add some code? Has anyone else done this before?

Thanks,

Amy Dooley