Walmart sues Visa (again), wants to require use of PINs for debit transactions

Walmart has filed a lawsuit against Visa related to Visa's policy requiring merchants to allow cardholders to choose whether to enter a PIN for debit transactions, even if the customer uses a chip-enabled card. The problem?  Signature-based debit transactions are processed on Visa's debit network, often at a higher fee to the merchant than other network routing [...]