Hi Slotplayer,
those source ID’s is retention ID’s so we can analyse which promo convert better, these are sent to your players under your source ID’s and they are yours but our job is to optimise them and make you earn more, more they deposit more we both make 
you can test it yourself and see it stays under your affiliate stats.
Let me know if you have any other concerns,
Cheers,
Malci:wavey: