How to analyze data for fraud?

Question

Information Security

Good afternoon.
There are statistics on accrued bonuses under the loyalty program for the year in the form: date
, amount, card number, terminal number
. The actions are regular and some have already been caught, by a large number of transactions and by the frequency of payments (once every n days). How else can you check the data for the possibility of fraud?

Answer 1

ML, clustering

Answer 2

Take a specialist in economic security and entrust him with this task, I'm serious.
If there is none and you are extreme - read the classics