generated: '2026-07-25'
method: searched
source: https://developer.empower.com/api-catalog/oauth2-api
docs: https://developer.empower.com/api-catalog/oauth2-api
note: >-
  Empower publishes per-API "Release Notes" on the catalog pages, and this is
  the only versioned change record readable anonymously anywhere in the group.
  The notes are undated - they carry semantic version numbers only - so no
  release dates are recorded here rather than inferred. The Balance API catalog
  page carries no release notes at all. Canada Life publishes no changelog.
scheme: semver
scope: per-API release notes on the public catalog page
dated: false
current_version:
  api: Empower OAuth 2.0 API
  version: 2.3.0
entries:
- api: Empower OAuth 2.0 API
  version: 2.3.0
  date: null
  breaking: false
  additions:
  - Add supported query parameters for /auth endpoint.
  highlights: >-
    Expands the query-parameter surface of the /auth endpoint. The parameters
    themselves are named only in the login-gated reference documentation.
- api: Empower OAuth 2.0 API
  version: 1.3.1
  date: null
  breaking: false
  additions:
  - /token and /auth endpoint accept optional x-api-key http header.
  changes:
  - >-
    /token endpoint can result 400 status code with "invalid_grant" error
    message if requested oauth scope is not configured in oauth client profile.
  highlights: >-
    Documents the API-key header as optional on both OAuth endpoints and the
    invalid_grant failure mode for unconfigured scopes - the only published
    evidence that Empower enforces a scope vocabulary.
other_change_surfaces:
- name: Planned deployment cadence
  url: https://developer.empower.com/docs/status-and-maintenance
  detail: Deliverables deploy the second weekend of every month.
- name: Coming-soon API products
  url: https://www.empower.com/financial-professionals/experience/apis
  detail: >-
    Forward-looking product list (DC participant personal rate of return, DC
    plan provisions, DC investments) - captured in
    lifecycle/great-west-lifeco-lifecycle.yml as the roadmap.