A friend recommended a credit card discount software called Kahui. How does it work?

Personal experience is very good. Last Wednesday, my friends and I went shopping in Xizhimen. I'm hungry. If I want something to eat, I'll use Kahui to search. Later, it happened that A Jin Han people were engaged in activities in Xizhimen. I used the card of China Merchants Bank, and two people walked together, 1 person was free. There were only two of us, so we only spent 1 person's money, which was especially worth it! If it weren't for Kahui, the preferential information around would be even harder to find, so I love Kahui very much.