eHealth Ontario

ONE Access Gateway Transport Specification

ONE Access Provider Gateway is a modernized platform for enabling the integration of provider facing applications* with provincial clinical repositories and registries** in a secure and reliable manner. It is eHealth Ontario’s solution to better supporting the applications to access EHR data through the Application Program Interfaces (APIs) published via the ONE Access Provider Gateway.

*Provider applications include point-of-service systems supporting clinical workflow for Ontario’s healthcare providers.

**ONE Access Provider Gateway will support authorized provider applications to access provincial clinical repositories, which contain information from various domains, such as Laboratory, Medication, Diagnostic Imaging, Immunization and Acute and Community Care data. It will also support access to registries data contained in the Provincial Client Registry (PCR), and Provincial Provider Registry (PPR).


The ONE Access Gateway exposes a set of RESTful FHIR APIs protected by OAuth2/OpenID Connect authorization and authentication protocols via:

  • Provider Gateway – publishing APIs targeted for provider facing applications

Once a project with eHealth Ontario is initiated, the specification explains how to connect to the ONE Access Provider Gateway environments, and the technical details as to how to interact with the published APIs to access EHR data.


This specification is for trial use and will go through a formal governance committee review and approval process.

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This publication has been exempted from translation under the French Language Services Act as per O. Reg. 671/92. This publication is technical in nature and is available in English only due to its limited targeted audience.

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  • October 15, 2019

    Now available for public access

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