PHP Fatal error: Uncaught Error: Call to undefined function curl_init() ?

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It appears that the cURL extension is not enabled or installed on your PHP installation. To fix this issue, you need to install and enable the cURL extension. The process to do this varies depending on your operating system and web server setup.

For Debian/Ubuntu-based systems:

Install the cURL extension for PHP:

sudo apt-get update
sudo apt-get install php-curl

Restart your web server. If you are using Apache, you can run:

sudo service apache2 restart

Or if you are using Nginx with PHP-FPM, you can run:

sudo service php-fpm restart
sudo service nginx restart

For CentOS/RHEL-based systems:

Install the cURL extension for PHP:

sudo yum install php-curl

Restart your web server. If you are using Apache, you can run:

sudo service httpd restart

Or if you are using Nginx with PHP-FPM, you can run:

sudo service php-fpm restart
sudo service nginx restart