uc_braintree.module

<?php
// $Id: uc_braintree.module
require_once 'braintree/lib/Braintree.php';

function uc_braintree_payment_gateway() {
  $gateways[] = array(
    'id' => 'uc_braintree',
    'title' => t('Braintree'),
    'description' => t('Process credit card payments through Braintree.'),
    'settings' => 'uc_braintree_settings_form',
    'credit' => 'uc_braintree_charge',
  );

  return $gateways;
}

/*
 * Implementation of hook_settings_form
 */
function uc_braintree_settings_form() {
  $form['uc_braintree_environemnt'] = array(
    '#type' => 'select',
    '#title' => t('Environment'),
    '#default_value' => variable_get('uc_braintree_environemnt', 'sandbox'),
    '#options' => drupal_map_assoc(array('sandbox','production')),
  );
  
  $form['braintree_keys'] = array(
    '#type' => 'fieldset',
    '#title' => t('API Keys'),
    '#description' => t('This information is required for Ubercart to interact with your payment gateway account.  You can access your API keys on your Braintree control panel'),
  );
  $form['braintree_keys']['uc_braintree_merchant_id'] = array(
    '#type' => 'textfield',
    '#title' => t('Merchant ID'),
    '#description' => t('Your Braintree merchant ID'),
    '#default_value' => variable_get('uc_braintree_merchant_id', ''),
  );
  $form['braintree_keys']['uc_braintree_public_key'] = array(
    '#type' => 'textfield',
    '#title' => t('Public Key'),
    '#description' => t('Your Braintree public key'),
    '#default_value' => variable_get('uc_braintree_public_key', ''),
  );
  $form['braintree_keys']['uc_braintree_private_key'] = array(
    '#type' => 'textfield',
    '#title' => t('Private Key'),
    '#description' => t('Your Braintree private key'),
    '#default_value' => variable_get('uc_braintree_private_key', ''),
  );
  
  return $form;
}

/*
 * Implementation of hook_charge
 */
function uc_braintree_charge($order_id, $amount, $data) {  
  try {
    Braintree_Configuration::environment( variable_get('uc_braintree_environemnt', 'sandbox') );
    Braintree_Configuration::merchantId( variable_get('uc_braintree_merchant_id','') );
    Braintree_Configuration::publicKey( variable_get('uc_braintree_public_key','') );
    Braintree_Configuration::privateKey( variable_get('uc_braintree_private_key','') );    

    // Load the user and order
    global $user;
    $order = uc_order_load($order_id);
   
    // Create a Braintree transaction and submit information to create a payment
    $response = Braintree_Transaction::sale(array(
        'amount' => $amount,
        'creditCard' => array(
            'cardholderName' => $order->payment_details['cc_owner'],
            'number' => $order->payment_details['cc_number'],
            'expirationDate' => $order->payment_details['cc_exp_month'] . "/" . $order->payment_details['cc_exp_year'],
            'cvv' => $order->payment_details['cc_cvv']
        )
    ));

    $success = $response->success;

    // If payment was successful, add comment
    if ($success) {
      $context = array(
        'revision' => 'formatted-original',
        'type' => 'amount',
      );
      $message = t('Credit card charged: !amount', array('!amount' => uc_price($amount, $context)));
      uc_order_comment_save($order_id, $user->uid, $message, 'admin');
    } else {      
      
      if ($response->transaction->processorResponseCode != NULL) {
        // Handle processor response codes appropriately
        $message = "Error " . $response->transaction->processorResponseCode . ": " . $response->transaction->processorResponseText;
        drupal_set_message(t($message), 'error');
        
        // Log order comment
        uc_order_comment_save($order_id, $user->uid, $message, 'admin');
      } else {        
        // Handle validation errors
        foreach($response->errors->deepAll() AS $error) {
          drupal_set_message(t($error->message), 'error');
        }
      }
      
    }

    // Return result to have payment or error recorded
    $result = array(
      'success' => $success,
      'comment' => t('Card charged'),
      'message' => $success ? t('Credit card payment processed successfully.') : t('Credit card charge failed.'),
      'uid' => $user->uid,
      // 'data' => $data,
    );

    return $result;
    
  } catch (Braintree_Exception_Configuration $e) {
    // Catch missing configuration variables
    drupal_set_message(t("Braintree is missing configuration variables; check your gateway settings"), 'error');
    return;
  } catch (Exception $e) {
    drupal_set_message(t("Braintree returned an error: ". $e->getMessage()), 'error');
    return;
  }
  
}