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Building Credit Card Authorizers with Java

Building Credit Card Authorizers with Java
4 to 360 hours of flexible workload
valid certificate in your country

What Will I Learn?

You will implement every layer of a credit card authorizer in Java, starting with the payment domain model and repository layer, then moving into the core rule engine that evaluates velocity limits, card status, and available balance. You will build an ISO 8583 codec that converts raw bytes into typed domain objects and back. A non-blocking Java NIO server will handle concurrent TCP connections from acquiring systems. You will also add structured logging, Micrometer metrics, and integration tests that validate the full message pipeline. Finally, you will package the authorizer as a Docker image and apply JVM tuning for low-latency payment processing.

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Develop Skills

  • ISO 8583 Codec Development: Build a byte-level parser and serializer for financial messages.
  • Authorization Rule Engine: Implement velocity checks, balance validation, and fraud control rules.
  • Java NIO Networking: Design a non-blocking TCP server that handles concurrent payment connections.
  • Production Deployment: Package, containerize, and tune the authorizer for real-world transaction loads.

Suggested Summary

Before starting, you can change the chapters and workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workload.
Workload: between 4 and 360 hours

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