The 299 yuan deducted from the credit card machine is the deposit. The credit card machine deducted 299 yuan, which is the frozen deposit of the machine. Within the specified time. If it meets the criteria, the transaction will be returned. The deposit has been frozen. At present, credit card machines generally do not charge machine fees. Machines have no cost. Therefore, there will be frozen deposits when handling customers. Some have to deduct a deposit of 299 yuan, and automatically return the pos settlement card after the transaction reaches the standard. Not up to standard, the frozen deposit will not be refunded.