Need info to add prenote entries to custom payment file

Hello,

We are on PeopleSoft 9.2 and working on a project to migrate to a new bank. Currently, the PeopleSoft delivered pay cycle generates ACH file. We are creating a custom program to include payment entries from payment table. But prenote entries are not available in the payment table. The prenote supplier bank information is only available in the payment file with zero dollar amount but not available in payment table. How can we include that information in the custom file ? Is there any other table to look for. Thanks !