creloaded oscommerce Australia Post eParcel Integration

Hi, Considering need to integrate with Australia Post eParcel. We need integration to create consignment notes in the eParcel service. Currently can be done via exporting xml files into eParcel, but we would like a more automated option as this creates to many errors. Not sure if it can be done, so you will need experience of having done this in the past. Please advise estimated price. Thanks