Visa is planning a major change to how it calculates the interchange rate, a move that could result in higher merchant fees for e-commerce transactions, according to a report by Bloomberg. 

Bloomberg, citing a Visa document sent to banks, reported that that interchange rates would rise or fall depending on the type of merchant and the type of transaction involved. For example, e-commerce sales would incur higher rates, while real estate or education transactions would be set lower. 

Interchange fees are major bone of contention by retailers, and make up about $100 billion every year paid to banks.