When issuing, voiding, or returning an invoice in QuoteMachine, the customer's Credit Account is updated in Lightspeed accordingly.

To ensure these operations can happen correctly, the setting "No Store Credit Refunds" must be disabled from Lightspeed's register settings.

Register settings can be accessed in Lightspeed from From the main menu, under Settings > General Options.

When this setting is not properly set, you will see the following error message when the invoice or refund is exported to Lightspeed