Credit card readers are the front end to ... mobile device to accept cards and contactless payments by using a PayPal card reader and the PayPal payment app. All you need to do is download the ...

PayPal Holdings Inc. today posted better-than-expected fourth-quarter earnings, but reported payment volume growth that fell short of expectations, and its shares dropped 13% on the results.

Some companies, such as Square, offer a free credit card reader that plugs into your device. Others, such as PayPal and Clover, have credit card readers that connect wirelessly to your device.