Point of Sale machines to create sales orders

Hello,

We are on 4.7 and not able to use Netweaver for the moment. Does anybody have any ideas about moving point of sale information from the machines into SAP? The machines do not come with a data converter, this would be done in an ABAP program. The information is gathered nightly and comes in a flat file.

Would this be better suited for BAPIs or for IDocs? If an IDoc is better, do you have an example program that would show how the IDoc should be created?

Lots of questions but I really want to choose the best option to integrate these machines into SAP.

Thanks,

Oscar Metcalfe

ps We do not have SAP-Retail