Can I authorize a charge and then wait to settle it later?

Follow

Yes, but you’ll have to settle it within the same business day. 

Setting the IsPreAuth to “true”, will authorize the amount from the card, without charging your customer. 

You will then have to log in to your account and manually locate and settle the transaction from your account statement. You can only do that in the same business day until 22:00 (GMT+2).