That is simply not true. There is not a single authentic study that shows such a thing, once you account for differences in jobs and experience. Two people with the same job and the same experience and qualifications are simply not paid differently in the real world.
Think about it rationally. If an employer could hire a women to do the exact same job as a man, to the exact same level of quality, but for lower pay, the employer would do that every single time. Men would be unemployable.
Women on average do make less than men. But that is do to several things from choosing lower paying careers, taking less risks in their career choices, taking more time off from the workforce, working less overtime, and many other socio-economic reasons. But women are not paid less to do the same job as men. That is a myth, completely and totally and continually spreading that myth does far more harm than good in helping advance equality.