public function handle_table_actions() {

		//Detect when a bulk action is being triggered...
		$action1 = $this->current_action();

		if ( in_array( $action1, array( 'delete', 'bulk-delete' ) ) ) {

			// verify the nonce.
			if ( ! wp_verify_nonce( wp_unslash( $_REQUEST['_wpnonce'] ), $action1 == 'delete' ? 'pum_subscribers_table_action_nonce' : 'bulk-subscribers' ) ) {
				$this->invalid_nonce_redirect();
			} else {

				$subscribers = isset( $_REQUEST['subscriber'] ) ? $_REQUEST['subscriber'] : array();

				if ( is_numeric( $subscribers ) ) {
					$subscribers = array( $subscribers );
				}

				$subscribers = wp_parse_id_list( $subscribers );

				if ( $subscribers ) {

					$status = array();

					foreach ( $subscribers as $subscriber_id ) {
						$status[] = PUM_DB_Subscribers::instance()->delete( $subscriber_id );
					}

					if ( ! in_array( false, $status ) ) {
						wp_die( sprintf( _n( 'Subscriber deleted!', '%d Subscribers deleted!', count( $subscribers ), 'popup-maker' ), count( $subscribers ) ), __( 'Success', 'popup-maker' ), array(
							'response'  => 200,
							'back_link' => esc_url( admin_url( 'edit.php?page=pum-subscribers&post_type=popup' ) ),
						) );
					} else {
						$succeeded = count( array_filter( $status ) );
						$failed    = count( $subscribers ) - $succeeded;

						if ( count( $subscribers ) == 1 ) {
							wp_die( __( 'Deleting subscriber failed.', 'popup-maker' ), __( 'Error', 'popup-maker' ), array(
								'response'  => 200,
								'back_link' => esc_url( admin_url( 'edit.php?page=pum-subscribers&post_type=popup' ) ),
							) );

						} else {
							wp_die( sprintf( __( '%d Subscribers deleted, %d failed', 'popup-maker' ), $succeeded, $failed ), __( 'Error', 'popup-maker' ), array(
								'response'  => 200,
								'back_link' => esc_url( admin_url( 'edit.php?page=pum-subscribers&post_type=popup' ) ),
							) );
						}

					}
				}

				wp_die( __( 'Uh oh, the subscribers was not deleted successfully!', 'popup-maker' ), __( 'Error', 'popup-maker' ), array(
					'response'  => 200,
					'back_link' => esc_url( admin_url( 'edit.php?page=pum-subscribers&post_type=popup' ) ),
				) );

				exit;
			}

		}

		/*
		 * Note: Table bulk_actions can be identified by checking $_REQUEST['action'] and $_REQUEST['action2']
		 *
		 * action - is set if checkbox from top-most select-all is set, otherwise returns -1
		 * action2 - is set if checkbox the bottom-most select-all checkbox is set, otherwise returns -1
		 */

		// check for individual row actions
		$the_table_action = $this->current_action();

		if ( 'view_usermeta' === $the_table_action ) {
			$nonce = wp_unslash( $_REQUEST['_wpnonce'] );
			// verify the nonce.
			if ( ! wp_verify_nonce( $nonce, 'view_usermeta_nonce' ) ) {
				$this->invalid_nonce_redirect();
			} else {
				$this->page_view_usermeta( absint( $_REQUEST['user_id'] ) );
				$this->graceful_exit();
			}
		}

		if ( 'add_usermeta' === $the_table_action ) {
			$nonce = wp_unslash( $_REQUEST['_wpnonce'] );
			// verify the nonce.
			if ( ! wp_verify_nonce( $nonce, 'add_usermeta_nonce' ) ) {
				$this->invalid_nonce_redirect();
			} else {
				$this->page_add_usermeta( absint( $_REQUEST['user_id'] ) );
				$this->graceful_exit();
			}
		}

		// check for table bulk actions
		if ( ( isset( $_REQUEST['action'] ) && $_REQUEST['action'] === 'bulk-download' ) || ( isset( $_REQUEST['action2'] ) && $_REQUEST['action2'] === 'bulk-download' ) ) {

			$nonce = wp_unslash( $_REQUEST['_wpnonce'] );
			// verify the nonce.
			/*
			 * Note: the nonce field is set by the parent class
			 * wp_nonce_field( 'bulk-' . $this->_args['plural'] );
			 *
			 */
			if ( ! wp_verify_nonce( $nonce, 'bulk-users' ) ) {
				$this->invalid_nonce_redirect();
			} else {
				$this->page_bulk_download( $_REQUEST['users'] );
				$this->graceful_exit();
			}
		}

	}