About PayBuddy

PayBuddy is a Point of Sale (POS) app which demonstrates the use of EMV and ISO 8583 to enable payments using the Nexgo Android SDK. Work in Progress 🚧🚧🚧

Features

• Check card balance
• Card payment
• Automatic payment reversal for failed transactions
• Receipt printing

Build Tools

• Kotlin
• Kotlin Coroutines for network calls and other intensive operations
• Kotlin Flows for view-viewModel interactions
• Navigation Component for Navigation
• Dagger-Hilt for Dependency Injection
• Nexgo Android SDK to interface with the POS terminal kernel and for EMV operations
• JPOS for ISO operations
• ISO 8583 library for constructing and deconstructing ISO message sent to NIBSS
• Sockets for network operations
• OkHttp to assist with socket response parsing
• Bouncy Castle for cryptographic operations
• Timber for logging
• Shared preferences for storing simple data types

Screenshots

Home Screen

Card Balance Flow

Card Payment Flow

Key Exchange Flow

Extras

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Clips

N5 Device

Card Balance Flow

EMV.Sync.-.Card.Balance.Flow.mp4

Card Purchase Flow

EMV.Sync.-.Purchase.Flow.mp4

Failed case

EMV.Sync.-.Card.Purchase.Flow.Failed.state.mp4

N86 Device