Braintree Sandbox Testing (fake nonces)

Question

I am testing the Braintree sandbox (PHP) and even though I am using a fake-nonce, the transactions still show goes through valid

I have a dropin frontend and a PHP Backend

My backend code for testing looks like below:

$amount = '12.00';
$nonce = 'fake-processor-declined-visa-nonce';
$result = Braintree_Transaction::sale(['amount' => $amount, 
                                       'paymentMethodNonce' => $nonce, 
                                       'options' => ['submitForSettlement' => true]
                                      ]);
$debug = get_object_vars($result);
print_r($debug);

outcome

Array
(
    [success] => 1
    [transaction] => Braintree\Transaction Object
        (
            [_attributes:protected] => Array
                (
                    [id] => 9bnyb32r
                    [status] => submitted_for_settlement
                    [type] => sale
                    [currencyIsoCode] => EUR
                    [amount] => 12.00
                    [merchantAccountId] => somenamehere
                    [subMerchantAccountId] => 
                    [masterMerchantAccountId] => 
                    [orderId] => 
                    [createdAt] => DateTime Object

I assued the fake nouces are there for testing error outcome in the sandbox...or am I missing something

https://developers.braintreepayments.com/reference/general/testing/php#test-amounts

Answer 1

_{Full disclosure: I work at Braintree. If you have any further questions, feel free to contact support.}

Invalid nonces trigger an unsuccessful card verification response, but do not cause transactions to fail. In order to simulate an unsuccessful transaction, adjust the amount of the transaction instead.

Answer 2

Trying to test some similar things in PHP, I found some helpful, well-named test nonces in \Braintree\Test\Nonces in the PHP Braintree library. I was able to use fake-valid-visa-nonce to do the testing I needed to create a new payment method.