How Do Offline Payment Codes Work? Inside the Tech Behind WeChat & Alipay

Even without network connectivity, mobile payment apps like WeChat and Alipay can complete transactions using offline payment codes; this article explains the two common QR payment methods, the online and offline code schemes, the underlying OTP and HMAC‑SHA1 algorithms, and their security trade‑offs.

HMAC-SHA1Information SecurityOTP

0 likes · 13 min read

How Do Offline Payment Codes Work? Inside the Tech Behind WeChat & Alipay

Java Backend Technology

Sep 6, 2020 · Information Security

How Offline Payment Codes Work: From OTP to Secure Transactions

This article explains the two main mobile payment methods, details the online and offline payment‑code schemes, describes the OTP generation algorithm based on HMAC‑SHA1 and BASE32, and discusses the security trade‑offs and practical considerations of offline payment codes.

OTPmobile paymentsoffline payment

0 likes · 12 min read

How Offline Payment Codes Work: From OTP to Secure Transactions

Programmer DD

Apr 24, 2020 · Backend Development

Mastering Payment Code Integration: Flow, Revocation, and Reconciliation

This article explains how to implement payment‑code integration for major wallets like WeChat Pay and Alipay, covering synchronous API behavior, password‑prompt handling, revocation strategies, order status nuances, and daily reconciliation techniques to ensure accurate financial reporting.

AlipayPayment IntegrationReconciliation

0 likes · 10 min read

Mastering Payment Code Integration: Flow, Revocation, and Reconciliation