Within twenty (20) days following the end of each month during the Term, MPLS will submit to HSM for payment a written invoice for the amounts due under this Agreement for such month. The invoice will set forth the Fees, in the aggregate and itemized, based on the descriptions set forth on Exhibit B . Each invoice will contain documentation and other details in support of the invoiced amounts as HSM may reasonably require to validate such invoiced amounts. Except as otherwise provided in this Agreement, HSM shall reimburse MPLS monthly for all out-of-pocket costs and expenses reasonably incurred and actually paid by MPLS to Third Parties on behalf of HSM in connection with providing personnel to perform the Services (“ Expenses ”).