To setup the waiver code for an application:
  1. Go to onBoard 
  2. Hover over the Settings cogwheel and select Application Forms
  3. Click the pencil icon next to the application you would like to edit
  4. Select the Payment tab
  5. On the payment section, click Block Settings
On this screen, you will be able to select payment information, as well as entering the waiver code. When you allow someone to pay by check, once the check is in your hands, provide the user the waiver code, which will allow them to bypass the credit card payment.