Integrate WooCommerce to Nextcloud plugin admin_group_manager

Send requests from WooCommerce to endpoints of plugin admin_group_manager.

Configure the follow constants at wp-config.php

define( 'NEXTCLOUD_API_HOST', 'http://localhost');
define( 'NEXTCLOUD_API_LOGIN', 'admin');
define( 'NEXTCLOUD_API_PASSWORD', 'cLkw5-4MFJD-3zPEN-F5pZ3-pzQzg');