MA H1259

Prohibits payment card networks and covered credit card issuers (those with over $85 billion in consolidated assets) from fixing or conspiring to fix interchange fees with other issuers or networks

Requires covered credit card issuers to disclose interchange fees on monthly consumer statements within 180 days of enactment, showing whether fees were charged and the amount for each transaction

Bans interchange fees on the tax and gratuity portions of electronic payment transactions when merchants transmit that data during authorization or settlement

Prohibits charging consumers or merchants fees for disputed transactions until a finding of fact determines responsibility, and bars penalizing merchants for how they lawfully set prices

Establishes $1,000 civil penalty per transaction for violations of the tax/gratuity fee prohibition, authorizes Attorney General enforcement, and restricts use of transaction data to processing, fraud prevention, and customer service purposes