Fix. Exclusion. Added path invoice4u/v1/callback.

Author: alexandergull

inc/cleantalk-public-validate-skip-functions.php

@@ -253,7 +253,10 @@ function skip_for_ct_contact_form_validate()
         '86' => (isset($_POST['action']) && $_POST['action'] === 'check_email_exists'),
         // Handling an unknown action check_email_exists
         '87' => Server::inUri('cleantalk-antispam/v1/alt_sessions'),
-        '88' => apbct_is_in_uri('wc-api') && apbct_is_in_uri('WC_Invoice4U'),
+        '88' => (
+            (apbct_is_in_uri('wc-api') && apbct_is_in_uri('WC_Invoice4U')) ||
+            (apbct_is_in_uri('wp-json') && apbct_is_in_uri('invoice4u/v1/callback'))
+        ),
         // has direct integration lib/Cleantalk/Antispam/Integrations/MemberPress.php
         '89' => apbct_is_plugin_active('memberpress/memberpress.php') && Post::get('mepr_process_signup_form'),
         // WooCommerce recovery password form