Minsheng Bank credit card discount merchants can be found in official website. After entering official website, click on the credit card, and then find the preferential merchants, where you can find preferential information. I checked for you, and it seems that Quanjude has no discount.

You can download a mobile phone application called Youshuo, which contains a lot of preferential information, including credit cards. It's much more convenient than going to official website to find discounts by directly searching businesses or banks. I hope this helps.