1. Credit Card (English: credit card) is a non-cash transaction payment method and a credit service provided by the banking industry. Credit cards are generally plastic cards with a length of 85.60 mm, a width of 53.98 mm and a thickness of 0.76 mm (the dimensions are defined by ISO 78 10 and 78 16 series documents). There are also metal cards in the market, which are issued to cardholders by banks or credit card companies according to the credit and financial situation of users. The cardholder does not need to pay cash when using the credit card, and the bill will be repaid on the same day. Except for some credit cards combined with financial cards, credit cards are different from debit cards and ATM cards, and credit cards will not directly deduct money from users' accounts.
2. Customers or clients can refer to natural persons or companies that accept property, services, products or certain concepts. Buyers of commercial services or products may be the final consumers, agents or middlemen in the supply chain. In marketing theory, suppliers must know the supply and demand of customers and their markets before doing business, otherwise "hard-selling" advertisements afterwards are just a waste of resources and not environmentally friendly. In modern society, "customer is God" is a popular slogan in business circles. In customer service, there is a saying that "the customer is always right". However, each party has different interpretations, such as the personal definition of the word customer.