Qiuefeng Wang, 57, of Fair Lawn was charged with prostitution following the incident at CW Body Works Therapy on Fair Lawn Avenue, Sgt. Brian Metzler said.
She was released on a summons to appear in court.
Police set up the sting after "receiving information of illicit activity," Metzler said.
He didn't identify which particular "service" was offered.
Click here to follow Daily Voice Cresskill-Closter and receive free news updates.