Semi-Noob Needs a Little Help with Promote/Ads

Okay so I have this kind of anon-influencer-personal but niche account and an app asked me to promo them in tweets. I did and they liked my tweets so much that they asked if I can promote/boost the tweets with $100 that they will send me. I said sure but there were no option for me to promote tweets so I changed it to a Business-account. Now I can see the option but it wants me to fill out a tax form with my company details. I'm just a random guy from a small European country and have no idea if I can just give some bullshit company details so it will let me pay with my card.

Can anyone help me how these things go? What's my most simple way to promote a tweet when I don't have a company? How influencers do this?

You most probably did not need to turn your account into a 'business' account.

Just use #ad or whatever the equivalent legal requirement in your country and you should be fine. You can worry about these things when you make more than $100 which I hope you'll be doing asap