Okla. Stat. tit. 58 § 385.3
Upon such hearing, if the court is satisfied that it is for the best interest of the estate and to the owners of such real estate he may make an order authorizing the guardian to borrow money, make, execute and deliver a note or notes therefor and to make, execute and deliver a real estate mortgage securing the same, in such amount, at such rate of interest and upon such terms and conditions as the court may prescribe and may, if he deems it advisable require an additional bond as in the case of the sale of real estate. After the order of the court authorizing the same is made, the guardian may make and execute the note or notes and mortgage and shall then present the same to the district court or judge thereof, who shall examine the same, and if they appear to be in conformity to law and the order of the court, the judge of the district court shall endorse his approval on the face of the mortgage. Thereafter the guardian may proceed to close the loan by receiving the funds so borrowed and by delivering the note or notes and mortgage. All such notes and mortgages shall be valid and binding obligations against the estate and against the real estate so mortgaged in accordance with the terms and conditions of such mortgage.
Okla. Stat. tit. 58, § 385.3