Can I use third-party customer-facing hardware with the Square POS app?

[#1]

The title of this thread has been changed from: Third Party terminal

I am wondering if any third party card readers would be compatible with the square pos system. Since I am in Canada, the customer display app is not available but I would love for my customers to see how much they are paying and be able to add a tip without having to turn my screen around. So this is why I’d be interested in a third party terminal. 
let me know, thanks