{"issuer": "https://hubspot-mcp.tail4a954d.ts.net", "authorization_endpoint": "https://hubspot-mcp.tail4a954d.ts.net/authorize", "token_endpoint": "https://hubspot-mcp.tail4a954d.ts.net/token", "registration_endpoint": "https://hubspot-mcp.tail4a954d.ts.net/register", "response_types_supported": ["code"], "grant_types_supported": ["authorization_code", "refresh_token"], "code_challenge_methods_supported": ["S256"], "token_endpoint_auth_methods_supported": ["none", "client_secret_post"], "scopes_supported": ["mcp"]}