Fatal error: Uncaught Braintree\Exception: The Braintree library requires the xmlwriter extension. in /var/www/html/Braintree_3DS_V2/braintree-php-4.2.0/lib/Braintree.php:18
Stack trace:
#0 /var/www/html/Braintree_3DS_V2/braintree-php-4.2.0/lib/Braintree.php(24): Braintree::requireDependencies()
#1 /var/www/html/Braintree_3DS_V2/getClientToken.php(28): require_once('...')
#2 /var/www/html/Braintree_3DS_V2/Braintree3DSv2.php(3): require_once('...')
#3 {main}
thrown in /var/www/html/Braintree_3DS_V2/braintree-php-4.2.0/lib/Braintree.php on line 18