Cash withdrawal by credit card is actually very easy to understand. You have a fixed amount when you apply for a credit card. If you think the amount is too low, you can apply to the bank for withdrawal. Of course, you must meet some conditions. For example, some banks require half a year to apply for a card, or reach a certain number of times and amount of credit card swiping. As long as it meets the requirements of the bank, you can apply for withdrawal. Specifically, you can call the customer service center directly to find out whether your credit card is full.