17 pages
POS
Point of Sale architecture, terminals, EMV flows, SoftPOS, and payment system design
Why PIN Still Matters in Card-Present Payments
Why EMV Chip Cards Resist Cloning: The ARQC Mechanism Explained
Scheme-Level Signaling: How Networks Identify Unattended Transactions
Offline EMV vs Store-and-Forward: Two Different Mechanisms, One Confusing Name
L3 Certification Paths Are Not Created Equal: C-TAP, SmartPOS, and SoftPOS
POS Terminal Environment Classifications: Attended, Semi-Attended, and Unattended
Prompt Engineering for POS: Treating LLM Inputs as First-Class Architecture
DUKPT Key Derivation: Technical Reference for POS Systems
PIN Translation: Bridging Cryptographic Worlds Inside the HSM
EMV Cryptograms: How ARQC Prevents Fraud
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