The extension of ICBC is credit card. ICBC's extension refers to the credit card extension service launched by ICBC, which can help cardholders to postpone the outstanding bills in the current period to the next billing date, thus reducing the consumption pressure of cardholders. The fee charged by ICBC for credit card extension service is charged in proportion to the extension amount, and the proportion is 1%. ICBC's credit card extension service also needs to charge a fee for each extension service in 5 yuan, even if the extension amount is in 0 yuan, it also needs to charge a fee in 5 yuan. Compared with ordinary savings cards, credit card fees are higher.