Semantic pattern · Traceable block decomposition
Payment gateway block decomposition
Payment gateway block decomposition
Traceable block decomposition of a payment gateway into card authorization, fraud screening, and settlement ledger, with a stable ID, inputs, outputs, constraints, and an implementation path carried as metadata on each block.
TIER 0 · ROOT
TIER 1
PAY-001
Payment Gateway
request → settlement
PAY-001-01
Card Authorization
card → token
PAY-001-02
Fraud Screening
token → score
PAY-001-03
Settlement Ledger
release → ledger