Project Overview
FoogleTech developed a comprehensive Android-based POS application on PAX hardware for retail merchants and restaurant/hospitality operators, supporting the full spectrum of modern payment methods: contactless NFC, EMV chip insert, magnetic stripe swipe, and QR-code payments. The system includes restaurant-specific tip management, full refund and void workflows, comprehensive transaction history, and an optimised end-of-day settlement process designed to reduce per-transaction processing costs.
The Engineering Challenge
- Merchants required a single terminal capable of accepting all modern payment methods — contactless, chip, swipe, and QR — without separate hardware or middleware for each tender type, demanding a unified payment abstraction layer across the PAX hardware SDK.
- Restaurant and hospitality operators needed a configurable tip-entry workflow that could be enabled or disabled per merchant, with tip amounts captured before authorisation and reflected correctly in settlement batches.
- Refund and void workflows required careful state management to handle partial refunds, same-day voids, and next-day returns correctly across all payment methods — with receipt reprinting and transaction history accessible from any terminal in the fleet.
- End-of-day settlement needed to be optimised to batch and close transactions in a sequence that minimised interchange fees and processing costs — a commercially critical requirement for high-volume merchants.
Our Solution
- FoogleTech built the POS application in Java on Android using Android Studio, with native C/C++ integration for the low-level PAX hardware payment SDK — creating a unified payment abstraction layer that routes each transaction to the correct hardware tender path (NFC, chip, swipe, or QR) without any merchant-facing configuration.
- A configurable tip workflow module was developed with merchant-level enable/disable settings, percentage and custom amount entry options, and pre-authorisation tip capture — fully integrated into both the receipt flow and EOD settlement batch to ensure tip amounts reconcile correctly against card network reports.
- Refund and void handling was implemented with full transaction state persistence — allowing operators to look up any prior transaction by receipt number or card last-four, process partial or full refunds, and reprint original or refund receipts from any authorised terminal.
- EOD settlement was redesigned with a batching algorithm that groups and submits transactions in the optimal sequence for the merchant's acquiring bank, reducing unnecessary authorisation holds and improving settlement timing — directly lowering processing costs for high-volume locations.
Results & Outcomes
- Single terminal now serving all four tender types — contactless NFC, EMV chip, magnetic stripe, and QR payments — deployed to retail merchants and restaurant operators without additional hardware investment.
- Restaurant tip workflow operating reliably across tip-enabled merchant accounts, with tip amounts reconciling correctly in EOD settlement batches and card network reports.
- Refund and void processing available for all payment methods with full transaction history access, receipt reprinting, and partial refund support — eliminating the manual workarounds previously required by merchant staff.
- EOD settlement optimisation delivered measurable reduction in processing costs for high-volume merchant accounts, with settlement timing improved to reduce overnight authorisation hold periods.
Why PAX POS Payment Terminal Chose FoogleTech Software
FoogleTech Software is a specialist engineering company with over a decade of expertise in AI, embedded systems, IoT, and full-stack software development — serving product teams and enterprises across Retail & Fintech and beyond. Our engineers don't just write code — they understand the domain, the constraints, and the real-world pressures that ship deadlines create. For PAX POS Payment Terminal, that meant deploying a pre-vetted team with direct experience in Android, Java, C/C++, reducing ramp-up time from months to days and delivering production-quality work from the first sprint.
Every FoogleTech engagement starts with a structured discovery phase, follows a disciplined agile delivery model with daily engineering syncs, and ends with complete documentation handover — so your in-house team owns the outcome. No black boxes, no lock-in.