Digital Wallet | Products

Overview

SGT Digital Wallet is a mobile-first consumer wallet with peer-to-peer transfers, bill payments, QR-based merchant pay, tokenised card storage, top-ups and cashback. It is delivered as a turnkey product — iOS and Android apps, a hardened wallet core, and integrations to local banking, card-scheme and Mobile Financial Services (MFS) rails — so a bank, telco or fintech can launch under its own brand in weeks.

Under the hood: a double-entry ledger with idempotent transactions, a PCI-DSS Level-1 card vault for tokenisation, a fraud-scoring engine that learns from per-user device and behaviour signals, KYC tiers (basic, NID, biometric), and dual-direction settlement to partner banks. Every event is auditable. The product is built for high-throughput micro-payments — 1,400+ TPS sustained — at low p99 latency.

P2P · QR · Bills · Top-ups · Cards — five core flows out of the box
Bank-grade ledger — double-entry, idempotent, immutable journal
Fraud scoring — device-bind, behaviour, velocity, geo-anomaly
KYC tiers — basic (phone), tier-1 (NID OCR), tier-2 (biometric + AML screen)

How It Works

Wallet App — iOS / Android consumer app showing balance, card carousel, QR scanner, recent transactions, cashback bar, and quick-actions (Send / Pay / Bills / Top-up). Biometric unlock and device-bind enforced.
Wallet Core — the double-entry ledger writes every move as paired debit/credit entries. Fraud scoring runs per transaction (12/100 typical; anything > 60 triggers step-up or block). Card vault is FIPS-validated HSM-backed.
Partner Rails — pre-built connectors to local commercial banks (NPSB / RTGS), card schemes (Visa / Mastercard), MFS networks (bKash / Nagad / Rocket-style), and bill aggregators (utility, telco top-up, school fees).
Users & Merchants — consumer push, SMS OTP, e-mail statement; merchant POS with QR generation, instant settlement, daily payout report, and refund-with-reason workflow.

Features

Peer-to-peer — by phone number, by wallet handle, by QR
QR pay — dynamic (merchant-presented amount) and static (consumer enters amount) variants
Bill payments — utility, telco recharge, internet, school fee, government, custom biller plug-ins
Card vault — add Visa / Mastercard / Amex; cards tokenised, never stored as PAN
Cashback engine — fixed, percentage, threshold, partner-funded; A/B test cohorts
Multi-currency — single wallet supports multiple ledger currencies with FX-time-of-spend
White-label — colour theme, logo, brand name, push-notification copy, app-store listing
Admin / ops console — KYC review, dispute resolution, manual hold / release, audit trail export

Use Cases

Bank-issued wallet — second app for a retail bank that wants a true digital-native experience
Telco-issued wallet — MNO launching an MFS-style wallet for postpaid + prepaid subscribers
Closed-loop merchant wallet — supermarket, fuel-retail, ride-hail in-app wallet with cashback engine
Payroll wallet — employer disbursement to unbanked / underbanked workforce
Government disbursement — direct-benefit-transfer wallet with KYC tied to national ID
Cross-border remittance — origination wallet, recipient pickup in partner wallet or cash-out

Specifications

Apps: native iOS (Swift) and Android (Kotlin); React-Native variant available for mid-market launches
Backend: Java / Spring core ledger, Go fraud engine, PostgreSQL primary store, Kafka event bus
Throughput: 1,400 TPS sustained per ledger shard, horizontal sharding by user-ID
Latency: p50 14 ms, p99 38 ms for a typical wallet-to-wallet transfer
Security: PCI-DSS Level 1, FIPS 140-2 HSM card vault, AES-256 at rest, TLS 1.3 in transit
Compliance: KYC tier model, AML watchlist screening, 3DS 2.x, regional regulator reporting templates
Deployment: private cloud (AWS / Azure / GCP), on-prem with HSM, or our managed SaaS
APIs: REST + gRPC for partners, WebSocket for live txn feed, OpenAPI 3.0 spec, SDKs in JS / Java / Python