Generally, ICBC can be divided into two types: debit cards and credit cards. Generally, debit cards have 19 digits and credit cards have 14-16 digits. The card number starts from 3/4/5/6. Bank Card is a credit payment tool issued to the society by commercial banks and postal savings and remittance institutions. It has all or part of the functions of consumer credit, transfer settlement, cash withdrawal, etc. A bank card is the basic proof of bank deposits.