Compliance
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PCI DSS 4.0 for Payment Developers: Requirements and Deadlines
PCI DSS 4.0 requirements affect how developers build payment systems. With future-dated requirements now mandatory as of March 2025, here’s what changed in Requirement 6 for secure development, the new MFA rules in Requirement 8, and how to reduce your PCI scope through architecture choices.
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What Is an Access Control Server (ACS) in 3D Secure?
The Access Control Server is the issuer-side component that decides whether to approve 3DS authentication frictionlessly or require a challenge. Understanding how ACS decisions work helps CTOs evaluate payment infrastructure and predict authorization rate impact.