If you use a credit card to withdraw cash to pay off another credit card, it is possible, but you need to bear the interest and handling fees of the credit card withdrawal. If necessary, you can directly transfer the credit card online, or Go to the ATM machine to transfer money.
However, if you want to use some third-party platforms to repay to avoid handling fees, it is strictly illegal, because you will change the use of credit card loan funds without the bank’s knowledge. It has been occupying the bank's funds for a long time, which is no different from cashing out on a credit card.
In fact, this method of repayment is just tearing down the east wall to pay for the west wall, that is, drinking poison to quench thirst, which will not fundamentally solve the problem.