Visa Revenue Model
Visa revenue through network fees, transaction processing, and value-added services.
Payment and Fintech
Payment flows, ledgers, fintech infrastructure, and the correctness, compliance, and reconciliation constraints behind moving money.
ACH Payment Processing
ACH payments through batch files, settlement windows, returns, and bank roles.
Visa Card Payment Flow
Visa card payments through authorisation, clearing, and settlement between banks.
How Apple Pay and Google Pay Work
Apple Pay and Google Pay tokenise card details and relay them through card rails.
Duplicate Payment Prevention
Duplicate payment prevention with idempotency keys, state checks, and safe retries.
Foreign Exchange Payments
Foreign exchange payments link local collection, currency conversion, and payout.
Payments Ecosystem
Payments ecosystem roles across merchants, processors, networks, and banks.
Payments System Fundamentals
Payment flows through authorisation, clearing, settlement, and reconciliation.
Payment System Architecture
Payment system flow through durable events, idempotent execution, ledgers, and settlement.
Money Movement Systems
Money movement through authorisation, clearing, netting, settlement, and reconciliation.
Scan-to-Pay Flow
Scan to pay flows through QR payloads, wallet checks, and payment settlement.
Unified Payments Interface (UPI) in India
UPI payment flow across apps, banks, identity checks, and NPCI switching.
Payment Reconciliation
Payment reconciliation across ledgers, settlement files, and bank records.
Handling Hotspot Accounts
Hotspot accounts create balance-write contention that payment systems must isolate.
4 QR Code Payment Models
Four QR payment flows covering merchant-presented, customer-presented, and account links.
SWIFT Payment Messaging System
SWIFT payment messaging for standardised cross-border transfer instructions.
Web3
Web3 shifts identity, assets, and rules from platforms to shared protocols.
Stop-Loss Orders
Stop-loss orders trigger an exit when price crosses a set threshold.
Banking Wallets vs. Blockchain Wallets
Bank and blockchain wallets compared through custody, ledgers, and settlement.
E-Commerce Workflow
E-commerce workflow from procurement and inventory to checkout and fulfilment.