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What do you mean by the main card and the secondary card of China Merchants Bank?
The secondary card is the secondary card of the main card, and the consumption is included in the main card account.

The use of this card, for example, parents hold the main card, children hold the secondary card, and children's consumption is included in their parents' accounts. If SMS notification is enabled, parents can also monitor their children's consumption. The important thing about this kind of card is that the secondary cardholder is convenient to use and the primary cardholder repays.