The purpose of a Payin or Payout is to accept money into the till that is not linked to a transaction. The action can be found within Tills (see article here: https://support.revelsystems.com/hc/en-us/articles/204178849-How-to-Use-Tills-Function )
To perform a Payin or Payout More information here for more information on reporting in Revel Systems about Payin and Payouts: https://support.revelsystems.com/hc/en-us/articles/204838345-Payouts-Payins-Report
Here is an example of reporting from the Revel backend of a Payin andOut. Payin is $600 and Payout is $500. To see this screen, log in to the Revel URL and click on Reports > Sales Summary and choose the date range.
Within QBDT Refer to Journal Entries to find Payin and Payouts.
Example here of the Payin:
Example of Pay Out: