If you are no longer accepting a certain type of custom payment and you want to remove or deactivate it so that your front desk can no longer accept that custom payment, you must do the following:
Ensure that you are at the Organization level.
Navigate to Admin > Categories > Custom Payments.
A list of custom payments appears.
Click the custom payment that you wish to remove.
The custom payment details appears.
Clear the Active checkbox and click Save.
The custom payment is deactivated and will not appear in the POS window.