You can find information about participant payments in the online query.
Click on 'Query' and go to the 'Participant' query:
In the next screen you can see the internet Id of the participant. Use this Id to search in the payment query.
Open the 'Payments - submitted Participants' query and seach for the internet Id of the participant.
This screen contains the payment information about the participant. For security reasons the table is empty in the example.