The main card is a multi-user card. The main card performs the management function, and can query the transaction details of the secondary card, allocate the amount for the secondary card, and handle various businesses of the secondary card. The main card itself can also be used as a fuel card.

The secondary card of the multi-user card can only be used for refueling.

Extended data:

Benefits of using fuel card:

1, it is convenient and quick to use the fuel card. First, you can avoid the trouble of carrying cash and cash change;

2. When there are many people, you can refuel yourself to reduce the waiting time;

3. You can also enjoy the refueling discount by recharging with some bank cards;

4. Accumulate a score per liter of oil, and the score can be exchanged for gifts to participate in the lucky draw;

5. Recharge the fuel card, query the fuel record and pre-allocate the unit card from the Internet or mobile phone without leaving home; For more value-added services, please refer to other columns or posters in the station.

Reference source: Baidu Encyclopedia-petrochemical refueling card, China