I solved it by deleting the existing code instead of xxxxxx. This is through experience, and I do not know whether this is correct or incorrect.
This is the path of the file in which you want to change the code, and the code as well:
PHP:
react nulled path in admin: /app/CentralLogics/helpers.php
public static function activation_submit($purchase_key)
{
$post = [
'purchase_key' => $purchase_key
];
$live = 'xxxxxxx';
$ch = curl_init($live . 'xxxxxx');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, $$$false$$$);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
$response = curl_exec($ch);
