The public finance authority is authorized and empowered to obtain from any entity of the state, any department or agency of the United States of America, or any nongovernmental insurer any insurance, guaranty, or liquidity facility, or from a financial institution a letter of credit to the extent such insurance, guaranty, liquidity facility, or letter of credit now or hereafter available, as to, or for, the payment or repayment of, interest or principal, or both, or any part thereof, on any bonds issued by the public finance authority, or on any municipal securities purchased or held by the public finance authority, pursuant to this chapter; and to enter into any agreement or contract with respect to any such insurance, guaranty, letter of credit, or liquidity facility, and pay any required fee, unless the same would impair or interfere with the ability of the public finance authority to fulfill the terms of any agreement made with the holders of its bonds.