General preferential merchants can be found on the bank's official website. For example, after China CITIC Bank entered official website, it clicked on the credit card and then found the preferential merchants. After entering, you can find the preferential merchants of credit cards by choosing the city category according to the prompts. Most bank credit cards have preferential merchants, especially the larger banks. There are many preferential merchants, and some discounts are very powerful. In addition, there is a more convenient method. There is a mobile phone application called Friends. You can know which credit card this merchant swipes and what kind of discounts it has, or you can directly search a bank to find the preferential information of the bank's credit card. Personally, it's quite easy to use, and I hope I can help you.