traffic refers to the maximum cumulative limit of the supplementary card used outside the natural month you set (which is the same as the credit card limit by default). If your credit card limit is $1,, then by default, the supplementary card bill will use up to $1, outside the natural month. Even if repayment is made to the supplementary card in the current month, the flow will be quantitatively unrecoverable and will need to be restored in the next billing cycle. This function supports the main card customer to adjust the flow limit of the supplementary card that has applied for a credit card. Tips: At present, only Great Wall series credit cards of Bank of China are supported.