The fuel card of China Petrochemical Company can only be used at the gas station of China Petrochemical Company, and it can be plugged into the tanker to refuel. Credit cards can't be inserted directly into the tanker. China Petrochemical's fuel payment system does not use POS machines to swipe cards, so it is impossible to refuel with the credit card you mentioned. Unless you recharge your fuel card with a credit card and then use it to refuel.

There is no direct price discount for refueling in China Petrochemical Company, whether in cash or by credit card. But if you use a credit card to refuel, you can redeem prizes online, that's all.