Understand the LSRetail transaction

Pheidole

Hello to all.
I am a fresher in this community and i would like to make a question that maybe silly but i have spent a lot of time with no result in my investigation.
I have no access to an LS Retail solution source code but i have a challenge that i would like to win. We would like to offer a solution that needs integration
with LS Retail but needs only to process and understand the transaction.

So my challenge is to parse the transaction file that is coming out of an LS retail solution in order to understand the transaction items like for example what are the items purchased, the quantities etc. Is there a map of the format that the LS Retail platform uses in order to explain to me what is what inside the file and help me proceed. Is there any other better way to understand and decode the transactions from the POS?

Thank you very much for your effort and time answering this question