PIN "retry" scam getting popular - paying a the value of your pin. Some Gemalto Terminals are affected through tip processing while models 3M allow it straight forward. Watch for "Enter PIN" on POS. If you are presented with "Enter Amount" - put 0001 and watch the scammer face :)

Basic Concept: (there are variations with entering tips depending on POS module)

You decide to pay for a dinner with your card, usually at cheap restaurant, airport or tourist location for a small value.
Waiter skips the step of entering the amount, and proceed to ask you to enter your pin.
You enter your pin, which is very likely to be more then an order by a probability (unless it starts with 00) and push the green button, it get's set as amount.
After a small waiting, he prompts you to try again because of failed transaction.
You enter your PIN once again, actually confirming your transaction for the amount equal to your PIN.

Watch that POS actually asks for PIN entry - not the amount, and not the tip. Remember, failed transaction starts the process again. If you did not got a receipt of failed transaction, it's a red flag for charging you for your PIN value.

Shall it happens to be to high and your bank rejects it, eg. your pin is 9876 - another transaction is failed (now really), and scammer will execute a normal transaction third time.

* Say your are buying a coke and bill is $8, and your pin is 1234 - you would actually pay $1234. There's a variation on theme in US where tip is a vector of attack.

Some schemes do involve insurance company insider who is getting cut in order to tolerate % of chargeback merchant account receives, yet it get's into the area of organised crime.

These who dispute will get approved and get money back, while insider makes sure to statistically cover number of chargebacks not to trigger the blockage of merchant account. This way - there's no investigation as chargebacks are success, business is operational, stolen funds equal to these who don't dispute, fail to do it timely or simply don't even notice.

Bottom line is - everyone is happy.

Stay safe.