Paypal into bank and taxes?

How is it with using paypal and putting into the banks? This is done in amounts fo 7000-20000 about 4 times a month. We export a lot and use that for credit cards as we dont even want to think about the run around trying to set it up locally (we have gone through many hoops in related business stuff and honestly just dont bother anymore).

So how would taxes work, when its deposited into the bank they just say its ebay or paypal or something. I know banks watch closely when depositing larger sums from out of country, but have not had anyone say anything from paypal up to 30000nt.

If one were to pay taxes on it, would you then also need to setup and get a business license to be able to sell things online?

I ask because we are going for citizenship in another country and need to prove income, so want to have this as way of proof.