Whenever a loan of money is made, it is presumed to be made upon interest, unless it is otherwise expressly stipulated at the time in writing.
Okla. Stat. tit. 15, § 263
Whenever a loan of money is made, it is presumed to be made upon interest, unless it is otherwise expressly stipulated at the time in writing.
Okla. Stat. tit. 15, § 263