Add custom post type quota for different Pro Sites level

code.php

<?php
/*
 *
 * You just need to configure the $limits array. The elements are level ID - 1. So, if your level ID 1, the index will be 0.
 * Then for product index add the limit
 *
 */
 
$limits = array(
		'0' => array(
				'product' => 2
			),
		'1' => array(
				'product' => 3
			),
		'2' => array(
				'product' => 4
			),
                '3' => array(
				'product' => 5
			),
		);

add_filter( 'user_has_cap', 'check_pro_limit', 999, 3 );
function check_pro_limit( $allcaps, $caps, $args ) {
	$id = get_current_blog_id();
	global $psts, $limits;
	if( $id != 1 ){
		$level = $psts->get_level($id);
		if( is_array( $limits[$level - 1] ) )
			foreach ($limits[$level - 1] as $post_type => $settings) {
				if ( wp_count_posts($post_type)->publish >= $settings ) {
					$pt_obj = get_post_type_object($post_type);
					unset($allcaps[$pt_obj->cap->publish_posts]);
				}
			}
	}
	return $allcaps;
}

add_action( 'admin_notices', 'message_notice' );
function message_notice() {
	$id = get_current_blog_id();
	global $psts, $limits;
	if( $id != 1 ){
		$level = $psts->get_level($id);
		$screen = get_current_screen();
		switch( $screen->post_type ){
			case 'product':
				$published_posts = wp_count_posts( 'product' )->publish;
				if( $published_posts >= $limits[$level - 1]['post'] ){
					?>
					<div class='error'>
						<p>Please upgrade to publish more products.</p>
					</div>
					<?php
				}
				break;
			
		}
	}
}