93.— (1) If a participating institution receives from NAMA or a NAMA group entity an amount in exchange for acquired bank assets that is more than is due to the participating institution under this Act, or receives any other amount from NAMA or a NAMA group entity to which it is not entitled, the institution shall repay to NAMA—

(a) in the case of overpayment of an amount due for the acquisition of bank assets, an amount equal to the overpayment and any accrued interest on it within the period that NAMA determines, or

(b) in any other case, an amount equal to the overpayment and any accrued interest on it within the period that NAMA determines.

(2) A certificate issued by NAMA under its seal as to the amount of an overpayment referred to in subsection (1) is admissible as evidence of the amount of that overpayment.