| OneLogin_Saml2_Auth | Main class of PHP Toolkit |
| OneLogin_Saml2_AuthnRequest | SAML 2 Authentication Request |
| OneLogin_Saml2_Constants | Constants of PHP Toolkit |
| OneLogin_Saml2_Error | Error class of PHP Toolkit |
| OneLogin_Saml2_IdPMetadataParser | IdP Metadata Parser of PHP Toolkit |
| OneLogin_Saml2_LogoutRequest | SAML 2 Logout Request |
| OneLogin_Saml2_LogoutResponse | SAML 2 Logout Response |
| OneLogin_Saml2_Metadata | Metadata lib of PHP Toolkit |
| OneLogin_Saml2_Response | SAML 2 Authentication Response |
| OneLogin_Saml2_Settings | Configuration of the PHP Toolkit |
| OneLogin_Saml2_Utils | Utils of PHP Toolkit |
| OneLogin_Saml2_ValidationError | This class implements another custom Exception handler, related to exceptions that happens during validation process. |