At present, online repayment of quick money is free, and there is no handling fee for either remittance bank or credit card. The advantage is that remittance banks support it much more, and most banks accept debit cards. The only drawback is, sign it quickly. The first real-name authentication cost of com is higher than that of other websites.
In addition, you can also choose "UnionPay Online", which is the official website of China UnionPay and has the same nature as Kuaiqian.com. The advantage of inter-bank repayment is that it is quick to arrive at the account and convenient to bind the cards under its name. The disadvantage is that there are few remittance banks currently supported, and the four major banks basically do not support them (it is said that they will be added one after another and are under negotiation).
In the topic of repayment of China Merchants Bank in official website, the above two items are introduced. No matter which bank your credit card is, you can refer to the description inside. I believe it will help: /payback/