The decision comes after concerns were raised about the potential for fraud and money laundering. Barroso's ruling states that banks are now required to charge a fee for 'Pix' amendment transfers, which will help to mitigate these risks. The ruling is expected to have a significant impact on the use of 'Pix' amendments in Brazil, as it will make them less convenient and more expensive to use. However, it is also expected to improve the security and integrity of the payment system.