Projects · India
POS & Payments
Unified point-of-sale software for Indian retail and F&B chains, covering UPI and card flows, GST-compliant billing, kitchen or counter workflows, and headquarters reconciliation. Multiplexer Solution tailors peripherals, offline modes, and franchise reporting so multi-outlet operators see one source of truth. Integrations support inventory, loyalty, and accounting without duplicate data entry.

Overview
The POS & Payments stack is an Android-first retail platform engineered for Indian tax rules, digital payment ubiquity, and franchise governance. Stores run resilient checkout flows with thermal printers, weighing scales, and barcode scanners where required. Headquarters dashboards consolidate sales, tenders, voids, and GST summaries across outlets in near real time.
Customizations accommodate QSR speed screens, apparel variant matrices, and hybrid dine-in/takeaway workflows without forking the core codebase per brand.
Business context
Chains outgrow generic POS apps when GST filings, multi-brand menus, and settlement reconciliation become manual nightmares. Fragmented UPI QR stickers and cash drawers obscure true outlet performance and enable shrinkage.
A unified POS with enforced tender types, role-based discounts, and automated Z-reports gives finance teams defensible numbers and speeds month-end close. Franchise owners gain transparency into royalty calculations tied to actual billed revenue.
Scope & deliverables
Store operations
- Android POS with catalog management, modifiers, combos, and table/seat maps
- UPI, card, cash, and wallet tenders with split-bill and partial payment support
- GST-ready invoices with HSN/SAC fields and e-invoice readiness where applicable
Central control
- HQ portal for price lists, promotions, user roles, and outlet health monitoring
- Settlement reconciliation reports aligned to acquirer and UPI PSP statements
- API exports to Tally, Zoho Books, and custom data warehouses
Technical architecture
Outlet devices persist orders locally during brief outages, syncing to a PostgreSQL-backed API when connectivity returns. Conflict resolution favors outlet timestamps with server-side validation of sequence gaps. Payment intents integrate with certified UPI and card SDKs; sensitive keys remain in HSM-backed or PSP-hosted flows per PCI scope reduction patterns.
Reporting aggregates run as scheduled jobs with materialized views for dashboard snappiness; anomaly detection flags unusual void/discount patterns for loss prevention teams.
Implementation phases
- Phase 1 — Blueprint: Menu modeling, tax profiles, hardware inventory, and integration map.
- Phase 2 — Pilot store: Parallel run with legacy POS; staff training and receipt branding.
- Phase 3 — Rollout: Staged outlet migration with hypercare support windows.
- Phase 4 — Optimize: Promotions engine, loyalty hooks, and advanced inventory modules.
Outcomes & metrics
Retail clients typically measure success across speed, compliance, and control:
- 15–25% faster average checkout time after UI tuning for high-volume SKUs
- Near-zero GST filing discrepancies versus POS summaries when e-invoice modules are enabled
- Same-day HQ visibility into outlet sales versus T+1 manual uploads
- Reduction in unexplained cash variances through tender-level audit trails
Roadmap extensions include kiosk self-order, kitchen display systems, and supplier purchase order automation.
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