ISO8583: Payment System for Brazilian Government

About the Project

From 2018 to 2024, we developed and maintained a payment system for Brazilian municipal transport. The project operates on the ISO8583 protocol — an international standard for financial transactions.

Project Scale

Metric	Value
Transactions processed	380,052
Vehicles	6,851
Years in operation	6
System uptime	99.97%

What is ISO8583?

ISO8583 is an international standard for electronic transaction exchange, used by:

Banks and payment systems
POS terminals and ATMs
Government payment services

Standard Advantages

Universality — works with any banks
Security — encryption and verification
Reliability — protocol proven over decades
Scalability — millions of transactions per day

System Architecture

Terminal Level

Android applications on vehicles
Card reading and NFC
Offline mode with synchronization
GPS route tracking

Server Level

ISO8583 message processing
Routing to acquiring banks
Authorization system
Fraud detection module

Administrative Level

Real-time transaction monitoring
Reporting for municipalities
Terminal management
Bank reconciliation

Technical Challenges

1. Operation with Poor Connectivity

Brazilian cities have uneven cellular coverage. Solution:

Store-and-forward architecture
Local transaction caching
Automatic synchronization

2. High Uptime Requirements

Public transport operates 18+ hours daily:

Server clustering
Automatic failover
Hot standby

3. Financial Data Security

PCI DSS compliance
End-to-end encryption
HSM for cryptography
Transaction audit trail

Results

For Municipalities

Cash reduction: by 67%
Revenue transparency: 100% transactions in system
Collection savings: ~$180,000/year

For Passengers

Payment convenience: card or NFC
Boarding speed: -40% queue time
Security: no cash — no theft

For Carriers

Automatic accounting: real-time revenue
Fewer disputes: all data in system
Accounting integration: automatic reports

Technologies

Protocol: ISO8583 (jPOS framework)
Backend: Java + Spring Boot
Database: Oracle + PostgreSQL
Mobile: Android (Java)
Monitoring: Grafana + Prometheus
Security: HSM Thales

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