By the way, the card doesn’t have a credit card function.
Furthermore, one can also store a specific demon’s magic pattern for a period of one month. For Demon Hunters, before they go out on a subjugation mission, they go to the Hunter Association and record the current subjugation mission information on their citizenship card. Then, when they come back from the subjugation, they can calculate the difference in mana before they left, and collect their reward.