An explanation of how and when to use Basic Auth, OAuth and SSL/TLS security definitions in HL7 FHIR connections.

OAuth is often employed in processes requiring permissions to be granted to frontend applications and end users. Yet, what we typically need in API systems integrations is a way to secure connections between the integration middleware and backend systems without a need for any ongoing human interactions. OAuth can be a good choice for that scenario and this article shows how it can be achieved.