Payment Machine
How many times we swipe our credit or debt cards wrongly when we pay by payment machine. Some payment machines do not have a signifier like a small picture that shows the buyers the correct way to swipe their cards. Additionally, payment machine does not have constraint to show the buyers that they swipe their cards in incorrect way. The buyers only know that they swipe their cards in the wrong way if the seller tells them to swipe their cards again in the other way. Therefore, I suggest to have a feedback on these payment machines like a sound that let us know if we insert the card correctly or not. Also, it is better to have a constraint where the card cannot be swiped if we swipe it in the wrong way. Adding the feedback and the constraint principles will make the payment machine more usable.
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