Are there any promo codes currently?

Captain Marshall

If yes,

Where is the "promo codes" option in the game? I can't see it since I downloaded again.
What are these promo codes that are currently valid?

Also, I want to add this problem.

I can see "promo codes" option on the OSM website.
But, I can't see it in the OSM app.
Is there something wrong here?

Thanks in advance for your replies. Have a good game!

(You can also text me your replies in the game if you want, my username : Captain Marshall)