An example of getting the current domain post ID in WP Landing Kit. Might be of use if you are loading up ACF fields on a domain post or something similar.

wplk-get-current-domain-id.php

<?php

// e.g; 'mydomain.com'
$current_host = $_SERVER['HTTP_HOST'];

// This will return a WPLK_Domain object, if the domain can be found. Otherwise, NULL.
$domain = wplk_get_domain(  );

if($domain){
  $domain_id = $domain->post_id();
  
  // Use the domain ID here...
  
}