Funds Payable Working Cap Question

Need a hand in a 3 statement model. Working on an international payments company (think Paypal). I am trying to figure out if Funds Payable should be rolled up into Accounts Payable, and used in Non-Debt Working Capital formula.

The company's 10-k defines Funds payable as: "Funds payable to customers relate also to the Company’s payments solution and are originated by the amounts due to sellers held by the Company until the transaction is completed. Funds, net of any amount due to the Company by the seller, are maintained in the seller’s current account until collection is requested by the customer."

The funds are in the customer's accounts but not sure what the company is doing with it otherwise. Interest income?

Any help is much appreciated.