What is the membership card in walnut?

In the middle is a red guitar. According to the public comment website, the theme is white and red, with a red guitar in the middle, and the guitar bellows is marked with the words walnut. The membership card of Walnut Music Pub is universal in China. After spending, you can enter your membership card number at the counter to settle the bill. Membership card refers to the certificates issued by entertainment, fitness, beauty, tourism, catering and other industries as well as shopping malls, clubs, hotels, clubs and so on. , with a certain value, amount or consumption times, for cardholders to authenticate their membership in consumption activities, and to spend, exempt from payment or enjoy discounts.