Building Credit Card Authorizers with Java
Learn to build a production-grade credit card authorizer from the ground up using Java. This course covers the full authorization pipeline — from ISO 8583 message parsing and domain modeling to TCP networking and deployment. You will write real code that mirrors what runs inside actual payment systems.
4 to 360h flexible workload
certificate valid 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.
Elevify advantages
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
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