Extracting iExpense Emp Reimbursement Data to Pass to ADP

We have employees entering out of pocket expenses into iExpense.  Our goal is to have that data flow from iExpense to ADP so the employee is reimbursed in their paycheck. We already have an interface that extracts OTL(payroll timentry) data and formats according to ADP requirements.  I would like to include the iExpense data in that file, I assume I would have to update the interface code.

I'm a very new user in Oracle EBS, past position developer, I'm not very compfortable with the system other than I've think I can recognize the data in the expense tables.  Currently employees are reimbursed via ACH if they have ACH data on their records and  if not ACH the system sets them up as a vendor and prints a check.  I assume it goes to AP then treasury modules if an emp gets a check. Has anyone else done this and how was it done?  Thank you.