Visa USA Inc. has sent a letter to financial institutions that grant merchants approval to accept credit card transactions asking them to make sure companies stop using certain applications that do not comply with the Payment Applications Best Practices (PABP), a companion to the Payment Card Industry (PCI) Data Security Standard. PABP standards are presently voluntary, but Visa hopes eventually to make them part of the PCI requirements. The applications in question store sensitive card data, including PINs and card verification value numbers.

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