because inserting a business card on the door will have a certain impact on other people's lives, and the management of most residential areas is still relatively strict. If it is difficult for people who advertise small advertisements to enter the residential area without an access card, they must register with the property management company. In fact, most property management companies will block such vendors from the door, and it is definitely illegal to enter the residential area by other means.

a credit card, also known as a debit card, is a credit certificate issued by a commercial bank or credit card company to a consumer with qualified credit. It is in the form of a card with the name, expiration date, number and cardholder's name printed on the front, and a magnetic stripe and signature strip on the back.