If I void payment taken at front desk and applied during charge entry, where does the money go?

If a payment is voided prior to daysheeting then it is deleted from OP. There is no record of the payment as it will not be reflected in the audit log or in the patient's account.

If a payment is voided after it was posted on a daysheet then the money will be moved to the credits tab. All actions will be listed in the audit log, on reports, and on the patients claim history.