generated: '2026-08-07'
method: probed
source: https://exchange-login.billgo.com/oauth2/default/.well-known/openid-configuration
docs: https://docs.billgo.com/
docs_note: >-
  The BillGO developer reference is a private ReadMe project — https://docs.billgo.com/
  returns HTTP 302 to https://dash.readme.com/to/billgo-group for anonymous visitors —
  so no documented auth page could be read. Everything below is taken from the
  provider's own anonymously-readable OpenID Connect / OAuth 2.0 discovery documents,
  not from documentation.
summary:
  types:
  - openIdConnect
  - oauth2
  api_key_in: []
  oauth2_flows:
  - authorization_code
  - implicit
  - refresh_token
  - password
  - device_code
  - ciba
  pkce: true
  pkce_methods:
  - S256
  identity_provider: Okta
schemes:
- name: BillGO Exchange OpenID Connect
  type: openIdConnect
  openIdConnectUrl: https://exchange-login.billgo.com/oauth2/default/.well-known/openid-configuration
  issuer: https://exchange-login.billgo.com/oauth2/default
  authorization_endpoint: https://exchange-login.billgo.com/oauth2/default/v1/authorize
  token_endpoint: https://exchange-login.billgo.com/oauth2/default/v1/token
  userinfo_endpoint: https://exchange-login.billgo.com/oauth2/default/v1/userinfo
  jwks_uri: https://exchange-login.billgo.com/oauth2/default/v1/keys
  registration_endpoint: https://exchange-login.billgo.com/oauth2/v1/clients
  introspection_endpoint: https://exchange-login.billgo.com/oauth2/default/v1/introspect
  revocation_endpoint: https://exchange-login.billgo.com/oauth2/default/v1/revoke
  id_token_signing_alg_values_supported:
  - RS256
  token_endpoint_auth_methods_supported:
  - client_secret_basic
  - client_secret_post
  - client_secret_jwt
  - private_key_jwt
  - none
  code_challenge_methods_supported:
  - S256
  response_types_supported:
  - code
  - id_token
  - code id_token
  - code token
  - id_token token
  - code id_token token
  sources:
  - well-known/billgo-openid-configuration.json
- name: Okta org authorization server
  type: oauth2
  issuer: https://exchange-login.billgo.com
  metadata: https://exchange-login.billgo.com/.well-known/oauth-authorization-server
  grant_types_supported:
  - authorization_code
  - implicit
  - refresh_token
  - password
  - client_credentials
  - urn:ietf:params:oauth:grant-type:device_code
  note: >-
    This is the stock Okta org authorization server that ships with every Okta tenant.
    Its scopes are Okta administrative scopes (okta.users.read, okta.apps.manage, ...),
    not BillGO product scopes. Recorded for completeness; it is not the API's
    authorization surface.
  sources:
  - well-known/billgo-oauth-authorization-server.json
api_surface:
  endpoint: https://exchange.billgo.com/graphql
  transport: GraphQL over HTTPS POST
  observed:
    get_method: 405
    anonymous_typename_query: 200
    introspection: disabled by the server (IntrospectionDisabled)
  bearer_token: >-
    Not directly observable without credentials. The Exchange SPA is an Apollo client
    against this endpoint and authenticates through the Okta issuer above, so tokens
    are OIDC access tokens; the exact header name is not published.
gaps:
- No OpenAPI or GraphQL SDL is published, so security schemes cannot be derived from a spec.
- No public authentication guide; the reference is behind a ReadMe login.
- No API-key mechanism is documented or observable on any public surface.
x-evidence:
  fetched: '2026-08-07'
  probes:
  - url: https://exchange-login.billgo.com/oauth2/default/.well-known/openid-configuration
    status: 200
  - url: https://exchange-login.billgo.com/.well-known/oauth-authorization-server
    status: 200
  - url: https://exchange.billgo.com/graphql
    status: 200
    method: POST
  - url: https://docs.billgo.com/
    status: 302