Someone gave me he's card read it for me to use it until my arrive that is safe to use it
Someone lend me his card reader so I can use it until my arrived at is safe to use it?
it's safe if you use it with your account, the reader is only a device to read the credit card information and is connected to your account if you are using your cellphone app for example.
Yes, you can use any reader. all that matters is what account is signed in in the Square POS app on your device.
