Questioning a payment (“what’s that about then?”) – and comparing it to your knowledge on known ‘schemes’ from other cases – might only the first step of a long investigative process.
Of course, perhaps there is no problem and it’s all good. You might have questioned why your company paid such a large fee for “training expenses” and you find out that it was, indeed, necessary to train up so many of your business partners so that your products are handled correctly. Plus, there are proper receipts for all the payments you were concerned about.
But if the payments need to be investigated further, you are likely to ‘bump into’ attempts to justify them: “If we don’t pay, others will” is just one of them.