public function get_refresh_code() {

		$token_value = $this->get_sheet_refresh_token();
		$code        = '';
		if ( isset( $_GET['code'] ) && ! empty( $_GET['code'] ) ) {
			$code = sanitize_text_field( $_GET['code'] );
			$this->set_refresh_token( $code );
		}
		$value = $token_value ? $token_value : $code;

		return $value;
	}