In addition to the interest authorized by this chapter, the parties to a commercial loan may agree and stipulate for:
(1) a delinquency charge on the amount of any installment or other amount in default for a period of not less than 10 days in an amount not to exceed five percent of the total amount of the installment; and
(2) a returned check fee in an amount that does not exceed the maximum fee authorized in Section 3.506, Business & Commerce Code, on any check, draft, order, or other instrument or form of remittance that is returned unpaid or dishonored for any reason.