German banks are feeling the heat after documents exposed their willingness to process payments for international online casino operators.

On Wednesday, German newspaper Süddeutsche Zeitung and public broadcaster NDR fingered DZ Bank, Postbank, Hypo-Vereinsbank and Wirecard for processing payments from internationally licensed online casino operators, in apparent contravention of Germany’s current gambling laws.

Evidence of the four financial institution’s connections with the online gambling sites came via the release of the so-called Paradise Papers, the latest document dump by the International Consortium of Investigative Journalists (ICIJ) in its ongoing efforts to shine a light on the financial dealings of the world’s 1%.

So far, the banks have issued statements denying that their activities were in violation of current German gambling laws, which prohibit online gambling outside of sports betting.