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How do banks regulate credit cards and identify credit card cash?

The bank has a risk management system

When you are in the normal time, there is no problem

When touching the red line

The bank will give you a risk tip

Cash in general, the action is very obvious

So we do not do it so obvious when we are cashed out

For example, the total **** 10,000 amount, you swiped out 8,000 at a stroke.