Add javascript for FastSpring's Git Updater popup store.

git-updater-fastspring-popup.php

<?php
/**
 * Add FastSpring popup store script for Git Updater.
 *
 * @package FastSpringPopUpStore
 *
 * Plugin Name:       FastSpring Popup Store for Git Updater
 * Plugin URI:        https://gist.github.com/afragen/e7819dd1e17be5792c299dbef989d446
 * Description:       Add FastSpring popup store javascript for Git Updater.
 * Version:           0.1.0
 * Author:            Andy Fragen
 * License:           MIT
 * Requires at least: 5.9
 * Requires PHP:      7.2
 * Gist Plugin URI:   https://gist.github.com/afragen/e7819dd1e17be5792c299dbef989d446
 */

add_action(
	'wp_footer',
	function() {
		// phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript
		echo '<script type="text/javascript" id="fsc-api" src="https://d1f8f9xcsvx3ha.cloudfront.net/sbl/0.9.0/fastspring-builder.min.js" data-storefront="gitupdater.onfastspring.com/popup-gitupdater"></script>';
	}
);