First, apply for a mobile phone pos. Now many people can achieve a single card limit of 40,000 per day. For example, card A spent 20,000 yuan in a few days, and card A spent 20,000 yuan in card B on the repayment date. Card A was swiped with card C and returned with card B on the repayment date. Note that it is enough to stagger the billing date and repayment date. As long as the card is not frozen, it is equivalent to giving you 20,000-40,000 yuan for free use for decades, but you don't need to support 0.47% credit card processing fee every time. If you need to cash out for Chongqing, you can come to me.