Core token lifecycle and transaction validation sequence diagram illustrating two-phase processing: Phase 1 captures token storage in the Frontend APP via PI Microservice with Audit Log tracking, while Phase 2 routes transactions through FEP, RFT, PI authentication, and NVBK core accounting. Data flows synchronously between Frontend APP, PI Microservice, Audit Log, FEP, RFT, and NVBK components, with internal processing steps and async responses clearly marked. This architecture demonstrates secure token management and multi-stage transaction validation essential for payment systems requiring compliance and auditability. Fork this diagram on Diagrams.so to customize component names, add additional validation stages, or adapt the sequence for your payment processing pipeline. The two-scenario approach provides a reusable template for systems separating token provisioning from transaction execution.