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Sometimes when we finish the POS machine, we will receive the following reminder. Do you think about whether you have received it? 
A person with a credit card will always brush the POS machine regardless of the money in the card. As a financial electronic device, the pos machine needs a lot of attention when it is used daily. If you don't pay attention, it may cause serious "harm" to your credit card.
Why is a credit card facing such a danger when I brush a POS machine? Because the POS machine you brushed affects the interests of the bank, it is discovered by the bank that it will naturally take measures to protect its own interests, that is, it will be closely watched by the risk control system or even deducted from the card.
Regarding the POS machine, although it is brushed every day, many card friends do not understand it. POS machines can be divided into many different types according to different attributes. I will not list them here. I would like to know Baidu friends who want to know. But what you need to know is that this type of POS machine that will put your credit card at risk is called a code hopping machine. Sometimes we go to the store to swipe the card, but the one that came out is indeed a hospital. I don’t know if you have encountered such a situation. This shows that you are brushing the code machine.
At present, the rates of all POS machines are above 0.6%, but the rate of code hopping machines is often less than 0.6%. Let's first take a look at what the 0.6% rate of the POS machine has been shared with:
1) The sales organization of the POS machine is the so-called acquiring institution;
2) UnionPay, UnionPay relies on license monopoly to provide major banks with a transfer platform; and will withdraw 0.065% of the fees;
3) The issuing bank will issue a profit of 0.45%, but the bank will also provide you with various types of wool, equity and interest-free periods.
Unlock the code hopping machine
When you use the code hopping machine, it will automatically switch your consumption type to a low rate, even a 0 rate machine, such as a public welfare or hospital class machine, and even some hopping machines can take your consumption. Type goes to online payment. The purpose is to tamper with the type of consumption and gain more profits. There is a saying in this industry that high-rate rate is low, the rate is low, the rate is preferential, the rate is 0, and the rate is 0. Under the line jumper (swipe and scan code rates are not the same), so the choice of POS must choose a clear machine, do not jump code.
After the brush hopping machine, why the bank will control your card, this is obvious. The payment company benefits, and the bank's income will inevitably suffer serious losses. Banks can't stop the existence of code hopping machines, so they can only protect their own interests from the way they monitor credit cards. Therefore, we cannot blame the bank for not telling the feelings. The original interests of ourselves have been reduced, and no one has done anything.
I suggest that if you do not want to be deducted from the card, you will report the business, and the bank will calculate the account on the merchant's head and let go of your card.