Do I have to buy the pro license to submit game to union?

Can I use the free license or trial pro license to submit game to union? If I need to pay for the pro license, can I do it only after they accept my game?

If my game is not going to be accepted anyway, there is no point for me in paying for the pro license for personal use.

Unity Free is free for personal and commercial use. I would think it is fine since Union will be doing the publishing for You.

Thanks