Reporting fraud in apple pay

My bank has declined a number of payments to apple via apple pay that I have not initiated myself. I cannot see what these charges are for and don‘t see an option to report this as potentially fraudulent for review by apple. How do I do that? The payments didn‘t go through because of some inconsistent information which was rejected by the bank, so I am happy this was caught. But reviewing apple purchases at apple.co/purchases was not helpful because the decline payments are not listed. Also the amount is unusually high.