Learn how to build applications with the Varian ARIA API using practical C# examples. This article covers bearer token authentication, HttpClient configuration, FHIR resource lookups, reusable helper methods, pagination, and JSON parsing—providing the essential programming patterns needed to develop robust clinical automation tools that integrate with the ARIA API.

In this second installment of the ARIA API series, we explore the ARIA API Specifications Page and API Tester. Learn how to navigate FHIR profiles, operations, search parameters, radiotherapy resources, ValueSets, and real-world examples while discovering practical techniques for exploring and validating ARIA API workflows before writing code.

Explore the foundations of the Varian ARIA API and modern healthcare interoperability in radiation oncology. This introduction reviews HL7 FHIR concepts, ARIA API architecture, VAIS configuration, API client setup, and basic API testing while demonstrating how modern APIs can support clinical automation, workflow tools, reporting, and integration across oncology systems.