Error while integrating Braintree php

Question

I am using braintree to handle credit card payment in my codeigniter project and the Braintree_Transaction::sale throws invalid argument exception saying invalid keys message for billing address parameters . But i dont think there are any validation errors. What i am trying to do can be simplified as below:

$card_info = [
      'cardholderName' =>mysql_real_escape_string($_POST['full_name']),
      'number' =>mysql_real_escape_string($_POST['number']),
      'expirationMonth' =>mysql_real_escape_string($_POST['expiry_month']),
      'expirationYear' =>mysql_real_escape_string($_POST['expiry_year']),
      'cvv' =>mysql_real_escape_string($_POST['card_cvv']),
      'billingAddress' =[
              'firstName' =>mysql_real_escape_string($_POST['first_name']),
              'lastName'=>mysql_real_escape_string($_POST['last_name']),
              'streetAddress'=>mysql_real_escape_string($_POST['user_address']),
              'city'=>mysql_real_escape_string($_POST['user_city']),
              'state'=>mysql_real_escape_string($_POST['user_state']),
              'country' =>mysql_real_escape_string($_POST['user_country']),

                ]
       ]
       $result = Braintree_Transaction::sale(['amount'=>'4.99',
                                              'creditCard'=>$card_info,
                                              'options'=>['submitForSettlement' => true]
                                              ])

But when i run the following code i get following error :

 <br />
 <b>Fatal error</b>:  Uncaught exception 'InvalidArgumentException' with       message 'invalid keys: creditCard[billingAddress][city],   creditCard[billingAddress][country], creditCard[billingAddress][firstName], creditCard[billingAddress][lastName], creditCard[billingAddress][state], creditCard[billingAddress][streetAddress]' in   C:\xampp\htdocs\naya_admin\application\third_party\braintree\lib\Braintree\Util.php:343
 Stack trace:
     #0 C:\xampp\htdocs\naya_admin\application\third_party\braintree\lib\Braintree\TransactionGateway.php(48): Braintree\Util::verifyKeys(Array, Array)
      #1    C:\xampp\htdocs\naya_admin\application\third_party\braintree\lib\Braintree\TransactionGateway.php(251): Braintree\TransactionGateway-&gt;create(Array)
      #2 C:\xampp\htdocs\naya_admin\application\third_party\braintree\lib\Braintree\Transaction.php(480): Braintree\TransactionGateway-&gt;sale(Array)
      #3  C:\xampp\htdocs\naya_admin\application\modules\brain_tree\controllers\brain_tree .php(67): Braintree\Transaction::sale(Array)
      #4 [internal function]: Brain_tree-&gt;transaction()
      #5 in 
 <b>C:\xampp\htdocs\naya_admin\application\third_party\braintree\lib\Braintree\Ut il.php</b> on line 
     <b>343</b>
      <br />

Answer 1

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

Ilan Hasanov is correct that you need to pass the billing parameters separately from credit card details in the transaction call. In addition, you should replace "city" with "locality", "state" with "region", and "country" with whichever country field you are storing in your database

$billing =[
    'firstName' =>mysql_real_escape_string($_POST['first_name']),
    'lastName'=>mysql_real_escape_string($_POST['last_name']),
    'streetAddress'=>mysql_real_escape_string($_POST['user_address']),
    'locality'=>mysql_real_escape_string($_POST['user_city']),
    'region'=>mysql_real_escape_string($_POST['user_state']),
    'countryName' =>mysql_real_escape_string($_POST['user_country']),
];

In addition, to keep your PCI compliance burden low, I recommend passing a nonce to your server in place of the credit card details.