After the refund, the corresponding money will be returned to the corresponding credit card within a few days (different banks). After returning the goods, the overall credit line will not increase, but the available credit line will be restored to the line before online shopping.

For example:

The credit line of the credit card is 30,000 yuan, and the available line before online shopping is 27,000 yuan (I have already bought something of 3,000 yuan).

1) The online shopping cost is 1000 yuan, and the available amount after online shopping becomes 26,000 yuan;

2) When the online shopping refund arrives, the available credit line will be restored to 27,000 yuan; But the total amount of this credit card is still 30 thousand, which will not change.