Test Stripe credentials when adding gateway

app/Http/Controllers/AccountGatewayController.php

@@ -60,6 +60,8 @@ class AccountGatewayController extends BaseController
         $data['hiddenFields'] = Gateway::$hiddenFields;
         $data['selectGateways'] = Gateway::where('id', '=', $accountGateway->gateway_id)->get();
 
+        $this->testGateway($accountGateway);
+
         return View::make('accounts.account_gateway', $data);
     }
 
@@ -322,6 +324,16 @@ class AccountGatewayController extends BaseController
         }
     }
 
+    private function testGateway($accountGateway)
+    {
+        $paymentDriver = $accountGateway->paymentDriver();
+        $result = $paymentDriver->isValid();
+
+        if ($result !== true) {
+            Session::flash('error', $result . ' - ' . trans('texts.gateway_config_error'));
+        }
+    }
+
     protected function getWePayUpdateUri($accountGateway)
     {
         if ($accountGateway->gateway_id != GATEWAY_WEPAY) {

app/Ninja/PaymentDrivers/BasePaymentDriver.php

@@ -44,6 +44,11 @@ class BasePaymentDriver
         return $this->accountGateway->gateway_id == $gatewayId;
     }
 
+    public function isValid()
+    {
+        return true;
+    }
+
     // optionally pass a paymentMethod to determine the type from the token
     protected function isGatewayType($gatewayType, $paymentMethod = false)
     {

app/Ninja/PaymentDrivers/StripePaymentDriver.php

@@ -39,6 +39,21 @@ class StripePaymentDriver extends BasePaymentDriver
         return $rules;
     }
 
+    public function isValid()
+    {
+        $result = $this->makeStripeCall(
+            'GET',
+            'charges',
+            'limit=1'
+        );
+
+        if (array_get($result, 'object') == 'list') {
+            return true;
+        } else {
+            return $result;
+        }
+    }
+
     protected function checkCustomerExists($customer)
     {
         $response = $this->gateway()

resources/lang/en/texts.php

@@ -2049,6 +2049,8 @@ $LANG = array(
     'no_contact_selected' => 'Please select a contact',
     'no_client_selected' => 'Please select a client',
 
+    'gateway_config_error' => 'It may help to set new passwords or generate new API keys.',
+
 );
 
 return $LANG;