Business Software And Services Reviews G2 Authentication

generated: '2026-08-14'
method: searched
source: openapi/business-software-and-services-reviews-g2-v2-openapi.yml, openapi/business-software-and-services-reviews-g2-data-solutions-openapi.yml,
  https://documentation.g2.com/docs/developer-portal, https://documentation.g2.com/docs/g2-mcp-server,
  https://www.g2.com/.well-known/openid-configuration
summary:
  types:
  - http
  - oauth2
  oauth2_flows:
  - authorizationCode
schemes:
- name: AccountAPIToken
  type: http
  scheme: bearer
  sources:
  - openapi/business-software-and-services-reviews-g2-data-solutions-openapi.yml
  - openapi/business-software-and-services-reviews-g2-v2-openapi.yml
- name: G2OAuth
  type: oauth2
  flows:
  - flow: authorizationCode
    authorizationUrl: https://www.g2.com/oauth/authorize
    tokenUrl: https://www.g2.com/oauth/token
    scopes: 6
  sources:
  - openapi/business-software-and-services-reviews-g2-data-solutions-openapi.yml
  - openapi/business-software-and-services-reviews-g2-v2-openapi.yml
docs: https://documentation.g2.com/docs/developer-portal
description: G2 runs two parallel auth models against the same API. AccountAPIToken is an HTTP Bearer
  access token issued self-serve in the G2 Developer Portal, scoped to a User or an Organization, with
  per-endpoint permissions chosen at issue time and a hard one-year expiry; it secures 52 of the 62 published
  operations. G2OAuth is OAuth 2.0 Authorization Code with PKCE against G2's own authorization server,
  used for delegated access and required by the MCP server. G2 does NOT support RFC 7591 Dynamic Client
  Registration — OAuth apps are pre-registered by hand — and its authorization callback omits the `state`
  parameter, which breaks stock MCP SDK callback handlers.
discovery:
  openid_configuration: well-known/business-software-and-services-reviews-g2-openid-configuration.json
  oauth_authorization_server: well-known/business-software-and-services-reviews-g2-oauth-authorization-server.json
  mcp_protected_resource: well-known/business-software-and-services-reviews-g2-mcp-oauth-protected-resource.json
  issuer: https://g2.com
  authorization_endpoint: https://www.g2.com/oauth/authorize
  token_endpoint: https://www.g2.com/oauth/token
  revocation_endpoint: https://www.g2.com/oauth/revoke
  introspection_endpoint: https://www.g2.com/oauth/introspect
  userinfo_endpoint: https://www.g2.com/oauth/userinfo
  jwks_uri: https://www.g2.com/oauth/discovery/keys
  id_token_signing_alg: RS256
  subject_types: pairwise
  pkce_methods:
  - plain
  - S256
  grant_types:
  - authorization_code
  - implicit_oidc
  - refresh_token
  token_endpoint_auth_methods:
  - client_secret_basic
  - client_secret_post
registration:
  url: https://my.g2.com/developers
  dynamic_client_registration: false
  confidential_clients: true
  public_clients: true
  note: Register the OAuth app in the Developer Portal, choose per-endpoint Read permissions, and read
    client_id/client_secret from the app details panel. Requested scopes must match enabled permissions
    or the token request fails with "requested scope is invalid, unknown, or malformed".
tokens:
  access_token_lifetime: 1 year (Developer Portal access tokens)
  refresh: refresh_token grant supported on the OAuth path
  resource_owner: User or Organization, chosen at token creation
  transport: 'Authorization: Bearer <token>'
deviations:
- No RFC 7591 Dynamic Client Registration.
- Authorization callback returns `code` without `state`.
- The MCP server validates tokens via G2's introspection endpoint using its own credentials; without cross-application
  token introspection enabled on your OAuth app you get 401 after a successful OAuth flow.
scopes: scopes/business-software-and-services-reviews-g2-scopes.yml
unauthenticated_surface: openapi/business-software-and-services-reviews-g2-chatgpt-plugin-openapi.json
  declares auth type "none" for two product/report search operations on www.g2.com.