How does Automatic Clearing works?

Hi Experts,

I have a scenario where I want the automatic clearing to happen under a customer account with three open items:

Invoice $500

Payment1 $200

Payment2 #300.1

The difference is $0.01 but it is within the tolerance set in the clearing strategy so I am expecting the system to still automatically clear these 3 open items.

However, I am not sure how to "trigger" this automatic clearing to happen.

Any thoughts?