Walmart and a financial tech company are being sued over allegations the retail giant forced drivers to use costly, complicated deposit accounts in order to get paid and raked-in millions in the process.

The lawsuit alleges that Walmart deposited drivers’ pay into accounts with payment platform Branch Messenger without the drivers’ consent.

The Consumer Financial Protection Bureau sued Walmart and fintech company Branch Messenger for allegedly forcing more than a million delivery workers to use expensive deposit accounts to access their paychecks,