#define GRPC_AUTH_JSON_TYPE_INVALID "invalid"
#define GRPC_AUTH_JSON_TYPE_SERVICE_ACCOUNT "service_account"
#define GRPC_AUTH_JSON_TYPE_AUTHORIZED_USER "authorized_user"
+#define GRPC_AUTH_JSON_TYPE_EXTERNAL_ACCOUNT "external_account"
// Gets a child property from a json node.
const char* grpc_json_get_string_property(const grpc_core::Json& json,