After the Biz Center campaign ends, the deposit in Biz Money usage history is being depleted

Settlements are completed 4 days after the actual advertising date, and settlement proceeds until 4 days after the campaign end date.

This is because the advertising cost of the advertising platform (Meta) itself is not confirmed on a daily basis.
For example, if the campaign period is 1/1~1/5, the advertising cost used on 1/1 is confirmed on +4 days, which is 1/5.
Advertising costs are not depleted on the advertising date itself, but rather are depleted 4 days after the actual execution date, so the deposit is depleted until 4 days after the campaign ends.

Biz Center Usage Guide p.33