Filter AJAX Requests and WP calls to BGAPI to Dev.

bg-filter-to-dev.php

<?php
/**
 * Plugin name: BoldGrid Filter to Dev
 * Description: Filter AJAX Requests and WP calls to BGAPI to Dev.
 * Plugin URI: https://github.com/timelsass
 * Author: Tim Elsass
 * Author URI: https://tim.ph
 */
// Filter BoldGrid HTTP Requests made via WordPress.
function bg_filter_wp_to_dev( $preempt, $r, $url ) {
	$regex = '/(wp-(?:assets|staging|preview)|api)+(?!-dev)(.*\.boldgrid\.com)+/i';
	if ( preg_match( $regex, $url ) ) {
		$url = preg_replace( $regex, '$1-dev$2', $url );
		wp_remote_request( $url, $r );
		$preempt = true;
	}
	return $preempt;
}
add_action( 'pre_http_request', 'bg_filter_wp_to_dev', 10, 3 );

// Filter BoldGrid HTTP Requests made via AJAX.
function bg_filter_js_to_dev() { ?>
	<script>(function($){$.ajaxPrefilter(function(o){o.url=o.url.replace(/(wp-(?:assets|staging|preview)|api)+(?!-dev)(.*\.boldgrid\.com)+/i,'$1-dev$2')})})(jQuery)</script><?php
}
add_action( 'admin_head', 'bg_filter_js_to_dev' );