While OpenID Connect (OIDC) is built on top of OAuth2, it introduces specific endpoints for handling ID Tokens (the identity layer). In PingAM 8.0.2, when a client receives an ID Token, it is recommended to validate it locally using the provider's public keys. However, PingAM also provides a convenience endpoint for validation.

According to the 'OpenID Connect 1.0 Endpoints' documentation:

/oauth2/idtokeninfo (Option A): This is the dedicated endpoint designed to receive an ID Token as a parameter.8 It validates the token's signature, checks the expiration and audience, and returns the claims contained within the token in a JSON format. This is specifically used for unencrypted ID tokens.

/oauth2/userinfo (Option B): This endpoint returns claims about the authenticated user but requires a valid Access Token in the authorization header, not an ID Token.9

/oauth2/introspect (Option C): This is a standard OAuth2 endpoint (RFC 7662) used to check the metadata and 'activeness' of Access Tokens or Refresh Tokens, not the internal identity claims of an OIDC ID Token.10

/oauth2/tokeninfo (Option D): This is a legacy/non-standard endpoint that was used in older versions for Access Token validation and is not the primary OIDC validation endpoint in version 8.0.2.11

Therefore, for the specific task of validating an ID Token and retrieving its claims, /oauth2/idtokeninfo is the correct and authoritative endpoint in the PingAM 8.0.2 OIDC implementation.