Credit nearing Credit Limit/ Hold Theshold

I need a feature which notifies our customers or accounts team when a credit limit is nearing its threshold to avoid disruptions in ordering.

eg. Customer has a credit limit of £30,000 – I want to let them know that they are say £2,000 away from their credit limit so (£28,000) that they aren’t automatically put on hold. If they are put on hold automatically, they then cannot use the ordering portal which causes a problem for impulse ordering.

They might get to £29,999 credit and then the next order for £500 they cannot place. Which is a problem.