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What are the server requirements for WHMCS?

The server requirements for WHMCS are as follows:
Web server: Any that supports PHP (for example, Apache or Nginx).
PHP Version: 7.2 or later (PHP 7.4 preferred).
Database: MySQL 5.6 or later (MariaDB is also supported).
Web Server Extensions: PHP extensions such as PDO, cURL, SimpleXML, GD, and JSON are examples of web server extensions.
SSL Certificate: This is highly recommended for secure transactions.

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