android app for offline upi payments using *99# service

An Android App 💲 that is capable of doing OFFLINE PAYMENT transactions.

💰 An offline payment service

Offline Payments app for Akaunting

DuitNowQR Hardwareless Soundbox

Magento 2 Offline Payment methods (Cash and Prepaid)

Laraship E-commerce is an online Laravel eCommerce platform for your store or shop, powered By Laravel 5.5 to provide a comprehensive set of features for any e-commerce platform.

Cryptography-driven offline payment simulation using AES-256-GCM, ECDSA signatures, ECDH key exchange, and immutable hash-chained ledgers.

Implementing Unstructured Supplementary Service Data (USSD) to enable offline payment transactions on the Ethereum blockchain

Solana transactions when mobile internet down.

NFC-based blockchain payment system for college cafeterias using Solidity on Polygon and React Native. Supports tap-to-pay, wallet management, and optimized gas-efficient transactions.

my attempt at building offline upi payments. · in progress

Bank Offline payment

NFC-based blockchain payment system for college cafeterias using Solidity on Polygon and React Native. Supports tap-to-pay, wallet management, and optimized gas-efficient transactions.

A decentralized, mesh-routed offline UPI payment system leveraging hybrid RSA/AES-GCM encryption, atomic idempotency, and a store-and-forward gossip protocol for zero-connectivity environments.

Automated offline UPI payment app for Android using USSD *99# infrastructure. Features zero-internet dependency, intelligent USSD parsing, and QR scanner integration for seamless offline banking.

Offline UPI payment mesh — RSA-OAEP + AES-256-GCM encrypted packets relayed phone-to-phone via gossip protocol. Flask + SQLAlchemy + idempotency guarantees.

Java backend showcasing cryptography, distributed systems concepts, and secure offline payment processing.

A proof-of-concept for offline payments using mesh networking, hybrid encryption, and idempotent settlement.

Φ Pay — Offline-first sovereign payment terminal for Φ. Instant settlement, no chargebacks, verifiable receipts. No accounts, no processors, no database—just invoices + receipt glyphs sealed into a Portal Settlement file.