You have the option to add an adjustment as a debit or credit. A debit will charge the customer and a credit will give the customer a credit to their bill or apply it to their ledger (account).
You can apply adjustments directly in a users ledger or during the checkin process.
You can set a max value that anyone can use per gallon.
Keep in mind, you will need to turn this on in your User Settings: Allow basic users access to add Fuel Reimbursements on check-in? Select YES.
For basic users, they will add an adjustment on the second page of checkin.
Set a default value for your Adjustments
Your default value will automatically apply when adding a new adjustment.