Available line = credit line-cumulative payment line (unpaid part)
The withdrawal amount is usually less than the available amount, multiplied by a certain proportion (related to personal credit).
Both of them are linked to personal credit, that is, to the use time and repayment records.
According to the specific situation, according to the integrity of personal data, previous credit and income range for comprehensive evaluation. After using the credit card for a period of time, the limit may be lowered, or you can apply for an increase.