Building Credit Card Authorizers with Kotlin
Learn to build a production-grade credit card authorizer from the ground up using Kotlin. This course covers the full authorization lifecycle — from ISO 8583 message parsing and domain modeling to fraud detection, TLS networking, and containerized deployment. If you write backend systems and want deep expertise in payment infrastructure, this is the course that delivers it.
flexible workload of 4 to 360h
valid certificate in your country
What will I learn?
You will gain a thorough understanding of how card payment authorization works, including the roles of issuers, acquirers, and payment networks. You will implement an ISO 8583 parser, design a domain model using Kotlin sealed classes and data classes, and build a composable rule evaluation engine. The course covers TCP socket communication with TLS, Redis-backed velocity checks, and a configurable risk scoring pipeline. You will also integrate Kafka event streaming, apply cryptographic controls including MAC generation and HSM usage, and tune the JVM for low-latency performance. By the end, you will have a fully observable, containerized authorizer ready for production.
Elevify advantages
Develop skills
- ISO 8583 Parsing: Implement a full byte-level parser with field validation in Kotlin.
- Authorization Engine Design: Build a rule-based decision pipeline using ports-and-adapters architecture.
- Fraud Detection Integration: Wire velocity checks and risk scoring into a live authorization flow.
- Production Observability: Instrument a payment service with metrics, tracing, and structured logging.
Suggested summary
Before starting, you can change the chapters and the workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workloadWhat our students say
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