Okla. Stat. tit. 15, § 815
An application to the court under this act shall be by written motion or petition and shall be heard in the manner and upon the notice provided by law or court rule for the making and hearing of motions in an action. Unless the parties have agreed otherwise, notice of an initial application for an order shall be served in the manner provided by law for the service of a summons in an action.
Laws 1978, SB 627, c. 308, § 15, eff. October 1, 1978.