It’s the type of client, no place accepts just cash unless it caters exclusively to folks who only have cash.

Further this same type owner sells almost at cost and unlike any reasonable business that considers costs in their pricing these folks don’t.

Which is why you see cash only or price plus fixed fee if using a card.

I haven’t carried cash for over a decade and I don’t swipe at a place which charges a fee to do so.

Business lesson is:

Don’t keep important data on a non redundant, not backed, not encrypted, not identity managed device.

Outside of that you can take civil action and ask the police to look into criminal action.

Not exactly. They may just be asking the OP to organize the business as a nominee which is normal. OP could to this and immediately resign in writing. OP said creating a business not being a part of it.

More context would be needed to get a correct answer however if they are looking just to have a nominee organize things they can use a registered agent or attorney.

If they are asking you to enter into a operating agreement then you should not unless you have reviewed it.

I thought square was a credit card processor. How on earth was there a 30k tx?.

Is the 30k the batch amount or you had a single 30k transaction?

You need a business advisor. Welcome to real estate.