[SOLVED] What is the difference between void and refund when charging a card with preauth on flutterwave

I am trying to charge a card using the Flutterwave nodejs library. I want to use the preauth flow. What is the difference between void and refund in the preauth flow.

in preauth, you put a hold on some money on the card
in capture, you do a debit on some or all the money you preauth
in refund, you return the money you captured
in void, you remove the hold on the money you preauth

so void is the reversal of preauth and refund is the reversal of capture