if you don't have enough funds on your credit card, you can't activate the POS machine in general. POS machines need credit card authorization and fund transfer to complete the transaction. If your credit card does not have enough balance or available line, the POS machine will not be able to complete the transaction.

as for the security of POS machine, POS machine is a kind of equipment used to handle payment transactions, and its security depends on the operation of suppliers and users. Most POS machines use encryption technology to protect the security of payment information. In addition, POS machines usually need to interact with credit card networks or banking systems, and these systems are also protected by security measures. However, in order to ensure safety, users also need to take some preventive measures, such as regularly checking whether there are unauthorized changes in POS machines and ensuring the maintenance and update of POS machines.