How can I be assured I’ll get paid?

I do Rover- a dog sitting service. I recently boarded a dog through the app. The money goes to my PayPal after a few days after the service is done. The owner asked for my personal number and wants to set another week of boarding in a couple of weeks. But she doesn’t want to do it through Rover because a percebes he of the money doesn’t go to me but Rover. Should I ask for half the fee on the first day and the other half when she is picking up her dog? Or is that rude?