Checkout Consistency Contract
Transactional State Machine & Rollback Protocol
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Mode: Success
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EXECUTION LAYER // PRIMARY PATH
RECONCILIATION LAYER // ROLLBACK
VALID
RESERVED
CREATED
ABORT / FAIL
RETRY
CART VALIDATION
STAGE 01 // IDEMPOTENT
STOCK VERIFY
STAGE 02 // LOCKING
ORDER & INVENTORY
STAGE 03 // DECREMENT
COMMIT & CLEAR
STAGE 04 // PERSISTED
PRE-CHECKOUT RESET
SYSTEM ROLLBACK STATE
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