Unable to purchase mini movie on Playlet app due to unclear card reader instructions

CARD READER LOCATION

The mini short video that I want to watch is through an app called playlet.

in order to pay the $14.99 to watch the mini movie/show it’s asking me to hold my credit card up to the “READER “ I have less than zero clue what they are talking about and where this reader is located?

HELP!

[Re-Titled by Moderator]