openapi: 3.2.0
info:
  title: Photon website Agent discovery API
  summary: Public website API used by the Photon onboarding funnel and newsletter signup.
  description: Create or resume an onboarding session, save path-specific onboarding answers, submit a completed onboarding flow, and create Ghost newsletter signups. The companion onboarding schema endpoint returns the current path definitions, steps, and fields.
  version: '2026-05-13'
  contact:
    name: Photon Health
    url: https://photonhealth.com
servers:
- url: https://photonhealth.com
tags:
- name: Agent discovery
  description: Machine-readable discovery resources for agents and integrations.
paths:
  /openapi.json:
    get:
      tags:
      - Agent discovery
      operationId: getOpenApiSpec
      summary: Get this OpenAPI document
      responses:
        '200':
          description: OpenAPI 3.1 document for Photon website APIs.
          content:
            application/json:
              schema:
                type: object
  /.well-known/openapi.json:
    get:
      tags:
      - Agent discovery
      operationId: getWellKnownOpenApiSpec
      summary: Get this OpenAPI document from the well-known path
      responses:
        '200':
          description: OpenAPI 3.1 document for Photon website APIs.
          content:
            application/json:
              schema:
                type: object
  /.well-known/api-catalog:
    get:
      tags:
      - Agent discovery
      operationId: getApiCatalog
      summary: Get the API catalog linkset
      responses:
        '200':
          description: RFC 9727 linkset pointing to OpenAPI, docs, schema, and llms.txt.
          content:
            application/json:
              schema:
                type: object
components:
  securitySchemes:
    leadTokenHeader:
      type: apiKey
      in: header
      name: x-onboarding-lead-token
    leadTokenCookie:
      type: apiKey
      in: cookie
      name: photon_onboarding_lead
externalDocs:
  description: Photon developer documentation
  url: https://docs.photon.health/docs