Building Credit Card Authorizers with Java
Learn to build production-style credit card authorizers in Java using ISO 8583, low-latency TCP servers, routing, fraud stubs, and robust testing—so you can design secure, scalable payment flows that perform under real-world load.

from 4 to 360h flexible workload
certificate valid in your country
What will I learn?
Master the essentials of building a high-performance credit card authorizer in Java, from ISO 8583 fundamentals and message parsing to low-latency TCP servers and concurrency tuning. You will design routing and authorization logic, integrate simulated issuers and fraud engines, and implement robust error handling, security, logging, metrics, and deployment practices to deliver a reliable, extensible authorization prototype.
Elevify advantages
Develop skills
- ISO 8583 parsing in Java: build, validate, and test real card messages fast.
- Java TCP server design: craft low-latency, high-throughput payment endpoints.
- Credit authorizer logic: implement routing, rules, and ISO response mapping.
- Concurrent pipelines: optimize decode-authorize-encode flows with Java concurrency.
- Production-ready ops: add logging, metrics, security, and safe deployment.
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.What our students say
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