When publishing a loan, you can use the Payments tab of the LoanFile to input each payment made by the borrower prior to publication.  You should also provide the information related to the historical payment performance and default status. 

To the extent there are a significant number of payments, one alternative to save time is to aggregate all prior principal, interest, fees and other amounts paid into a single borrower payment using the most recent effective date.  Then use the memo functionality to advise purchasers that the particular payment represents the accumulated payments to date.  Combining that aggregate payment with historical payment performance and default status may be sufficient for certain purchasers.  LoanStreet makes no representations, warranties or guarantees of any kind that using this aggregate payment is sufficient for any potential purchaser.