Example of how to use plugin-update-checker to check for updates multiple plugins and enable automatic background updates if needed.

MyPluginUpdater.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

require_once __DIR__. '/plugin-update-checker-4.2/plugin-update-checker.php';

class MyPluginUpdater {


	private $bitbucketBaseUrl = 'https://bitbucket.org/bitbucket_user_name/';

	private $bitbucketConsumerKey = 'key_here';
	private $bitbucketConsumerSecret = 'secret_here';
	private $stableBranchName = 'master';

	private $plugins = [];
	private $updaters =[];

	private $masterPluginFILE = WP_PLUGIN_DIR. DIRECTORY_SEPARATOR . 'masterplugin'. DIRECTORY_SEPARATOR . 'masterplugin.php';
	private $masterPluginSlug = 'masterplugin';



	public function __construct($enableAutoUpdates = false) {

		$this->plugins  = glob(WP_PLUGIN_DIR . DIRECTORY_SEPARATOR . 'familyprefix-*' . DIRECTORY_SEPARATOR .'familyprefix-*.php');

		// master plugin enqueue separately first.
		$this->updaters[$this->masterPluginSlug] = Puc_v4_Factory::buildUpdateChecker(
			$this->bitbucketBaseUrl . $this->masterPluginSlug,
			$this->masterPluginFILE,
			$this->masterPluginSlug
		);

		// lets init checkers for updates for child plugins all child plugins have familyprefix-  starting their names with.
		foreach($this->plugins as $pluginFILE){
			$parts = pathinfo($pluginFILE);
			$pluginSlug = $parts['filename'];

			$this->updaters[$pluginSlug] = Puc_v4_Factory::buildUpdateChecker(
				$this->bitbucketBaseUrl . $pluginSlug,
				$pluginFILE,
				$pluginSlug
			);

		}
    

		// lets set all common access settings for updaters

		foreach($this->updaters as $slug => &$updater){

			$updater->setAuthentication(array(
				'consumer_key' => $this->bitbucketConsumerKey,
				'consumer_secret' => $this->bitbucketConsumerSecret,
			));

			$updater->setBranch( $this->stableBranchName );
		}

		if( $enableAutoUpdates ){
			add_filter( 'auto_update_plugin', [$this, 'enableAutoUpdatesForPlugins'], 10, 2 );
		}

	}

	public function enableAutoUpdatesForPlugins($update, $item){

		if( array_key_exists( $item->slug, $this->updaters ) ){
			return true;
		}

		return $update;

	}

}

// then in your master plugin instantiate this class in a constructor for example and
$MyPluginUpdater = new MyPluginUpdater(true); // to  enable autoupdates.