Labs
Interactive experiments that go with our deep dives. Pick a lab, step through the concepts, and see how things actually work under the hood.
3-D Secure Decision Tree
Simulate issuer ACS decisions across frictionless authentication, challenge flows, exemptions, soft-decline retry, liability evidence, and checkout state.
ATM Network Message Path
Trace a cash withdrawal through the ATM, acquirer switch, scheme network, issuer, dispenser, journal, reversal path, and settlement.
Bank Reconciliation Queue
Match internal ledger entries to external statement lines, classify amount and reference breaks, age unresolved items, and close controlled repairs.
Sharded Ledger Contention Simulator
Move payment requests across ledger shards, hot accounts, replay guards, posting queues, cut-off jobs, and reporting snapshots.
Card Payment Sequence
Follow one purchase from POS terminal through acquirer, scheme network, issuer authorisation, clearing, settlement, and merchant funding.