Online casinos comply with anti-money laundering (AML) regulations in payment systems by implementing robust Know Your Customer (KYC) procedures, which involve verifying the identities of players before they can deposit or withdraw funds. This often includes collecting personal identification documents, conducting background checks, and monitoring transactions for suspicious activity. Casinos also employ advanced data analytics and transaction monitoring systems to identify unusual patterns that may indicate money laundering. Furthermore, they are required to report any suspicious transactions to relevant authorities promptly and maintain comprehensive records of all financial activities.