Hi Richard
1. We do not support date filters in Payment Management at the moment, so it is not possible to export payment records from within a date range (in a year for example). Something I will support for in the future
2. We do not allow unpublish payment records unless it is using offline payment. The reason is simple: If you already paid for the payment, I don't see any reasons to mark it as unpaid
Regards,
Tuan