Array
(
    [type] => 1
    [message] => Uncaught Braintree\Exception\Unexpected: Unexpected HTTP_RESPONSE #502 in /var/www/html/application/libraries/braintree/Braintree/Util.php:79
Stack trace:
#0 /var/www/html/application/libraries/braintree/Braintree/Http.php(50): Braintree\Util::throwStatusCodeException(502)
#1 /var/www/html/application/libraries/braintree/Braintree/ClientTokenGateway.php(61): Braintree\Http->post('/merchants/bn2h...', Array)
#2 /var/www/html/application/libraries/braintree/Braintree/ClientTokenGateway.php(47): Braintree\ClientTokenGateway->_doGenerate('/client_token', Array)
#3 /var/www/html/application/libraries/braintree/Braintree/ClientToken.php(18): Braintree\ClientTokenGateway->generate(Array)
#4 /var/www/html/application/libraries/braintree/payment.php(1057): Braintree\ClientToken::generate()
#5 /var/www/html/application/libraries/MY_Controller.php(922): payment->braintree_clienttoken_generate()
#6 /var/www/html/application/libraries/MY_Controller.php(615): MY_Controller->user_login_form('item', '2869929')
#7 /var/www/ht
    [file] => /var/www/html/application/libraries/braintree/Braintree/Util.php
    [line] => 79
)