RMS Journals/receipts

I have a problem and hope that somebody has a solution.....


For a given transaction and subsequent journal entry how can I encrypt it for storage without using a POS plugin? We are currently trying to use Magento credit memos to update accounts in RMS without using a POS plugin because we are talking direct to the DB. We have everything else working but can't get the journals/receipts to display in RMS POS. Any ideas would be very appreciated.