Why it matters

PCI DSS applies to LLM apps in payments. Understanding shapes payment integrations.

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The architecture

Scope: LLM services touching CHD.

Isolate LLM from CHD environment.

Tokenize before LLM.

PCI + LLMCHD isolationkeep out of LLMTokenizationbefore LLM seesScope reductionminimize CDEBest: keep LLM entirely out of CDE via tokenization + isolation
PCI LLM.
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How it works end to end

Tokenize CHD before LLM.

Segment networks.

Third-party LLM: scope carefully.

Logging: no CHD in logs.