Payment Application for Android POS Terminals.
Own the terminal experience. Full EMV contact, contactless, swipe, and manual entry. Connects natively to Switch39 for smart routing and end-to-end encryption.
Your payment app, on your terminals, under your brand.
CardPay39 is Field39’s in-house payment application for Android POS terminals — full EMV support, zero-touch provisioning, and white-label branding, without depending on a third-party app vendor.
Zero-Touch Deployment
Technician plugs in the terminal — app, merchant profile, EMV config, and cryptographic keys auto-provision end-to-end via TMS. A complete box-to-production pipeline with no manual setup per site.
Full Card Acceptance
EMV chip, contactless/NFC, magnetic stripe, and manual keyed entry. Fallback handling between entry modes with distinct POS entry codes. Visa, Mastercard, Maestro, JCB, Amex.
Hardware-Level Security
SRED-certified encryption at point of read. DUKPT key management per transaction. Online PIN encrypted with isolated key pairs. HMAC-SHA512 signed communication. PCI DSS Level 1.
Remote Configuration
EMV kernels, CVM limits, card brands, UI branding, and operator credentials — all managed remotely via TMS and applied at boot.
From terminal to acquirer, fully managed.
CardPay39 runs on the terminal, provisions and configures over TMS, and routes every transaction through Switch39 to your acquirers.
Every transaction the floor needs.
Card-Present
Purchase (Sale), Authorize (Pre-Auth), and PIN-protected Refund.
Follow-On
Capture (full or partial), Void, and Incremental Authorization.
System
Technical Reversal, auto-generated on a communications failure.
Configured for how you operate.
Ship a profile that matches the environment — or define your own.
Retail
Purchase, refund, void, close day, multi-operator login, and ECR integration. Tipping and pre-auth disabled.
Hospitality
Purchase with tipping, pre-auth & capture, incremental auth, preset tips (10/20/30%), custom tip amount, and multi-operator login.
Custom
Bespoke profiles tailored to your workflow, card brands, and operational rules.
Built for the realities of the counter.
Multi-Operator Support
PIN-authenticated login, per-operator history, and automatic sub-batch close when operators switch.
Batch Settlement & Close Day
Running totals by type, host-confirmed settlement, and automatic batch ID rotation.
ECR Integration & Branding
Configurable ECR connectivity and a white-label UI with custom logos, colors, and language.
Diagnostics & Receipts
EMV kernel status, interface health, CVM limits, and pending reversals. Auto-print, reprint, virtual receipts, RRN lookup, and follow-on actions from the detail view.
Certified for Castles, designed for portability.
CardPay39 is currently certified for Castles Android terminals, with additional Android POS vendors on the near-term roadmap. The same app architecture carries across supported hardware.
Ready to deploy CardPay39?
Walk us through your terminal estate. We’ll show you what stays, what changes, and how fast it deploys.