diff --git a/app/Billing/Charge.php b/app/Billing/Charge.php
index 140db4d..8efdb7f 100644
--- a/app/Billing/Charge.php
+++ b/app/Billing/Charge.php
@@ -20,4 +20,9 @@ class Charge
     {
         return $this->data['card_last_four'];
     }
+
+    public function destination()
+    {
+        return $this->data['destination'];
+    }
 }
diff --git a/app/Billing/FakePaymentGateway.php b/app/Billing/FakePaymentGateway.php
index f30f1ef..a09a488 100644
--- a/app/Billing/FakePaymentGateway.php
+++ b/app/Billing/FakePaymentGateway.php
@@ -23,7 +23,7 @@ class FakePaymentGateway implements PaymentGateway
         return $token;
     }
 
-    public function charge($amount, $token)
+    public function charge($amount, $token, $destinationAccountId)
     {
         if ($this->beforeFirstChargeCallback !== null) {
             $callback = $this->beforeFirstChargeCallback;
@@ -38,6 +38,7 @@ class FakePaymentGateway implements PaymentGateway
         return $this->charges[] = new Charge([
             'amount' => $amount,
             'card_last_four' => substr($this->tokens[$token], -4),
+            'destination' => $destinationAccountId,
         ]);
     }
 
@@ -53,6 +54,13 @@ class FakePaymentGateway implements PaymentGateway
         return $this->charges->map->amount()->sum();
     }
 
+    public function totalChargesFor($accountId)
+    {
+        return $this->charges->filter(function ($charge) use ($accountId) {
+            return $charge->destination() === $accountId;
+        })->map->amount()->sum();
+    }
+
     public function beforeFirstCharge($callback)
     {
         $this->beforeFirstChargeCallback = $callback;
diff --git a/app/Billing/PaymentGateway.php b/app/Billing/PaymentGateway.php
index 0ca0840..c794a6b 100644
--- a/app/Billing/PaymentGateway.php
+++ b/app/Billing/PaymentGateway.php
@@ -4,7 +4,7 @@ namespace App\Billing;
 
 interface PaymentGateway
 {
-    public function charge($amount, $token);
+    public function charge($amount, $token, $destinationAccountId);
 
     public function getValidTestToken();
     public function newChargesDuring($callback);
diff --git a/tests/Feature/PurchaseTicketsTest.php b/tests/Feature/PurchaseTicketsTest.php
index 23851aa..26c7705 100644
--- a/tests/Feature/PurchaseTicketsTest.php
+++ b/tests/Feature/PurchaseTicketsTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature;
 
+use App\User;
 use App\Concert;
 use Tests\TestCase;
 use App\Facades\TicketCode;
@@ -60,7 +61,12 @@ class PurchaseTicketsTest extends TestCase
         OrderConfirmationNumber::shouldReceive('generate')->andReturn('ORDERCONFIRMATION1234');
         TicketCode::shouldReceive('generateFor')->andReturn('TICKETCODE1', 'TICKETCODE2', 'TICKETCODE3');
 
-        $concert = \ConcertFactory::createPublished(['ticket_price' => 3250, 'ticket_quantity' => 3]);
+        $user = factory(User::class)->create(['stripe_account_id' => 'test_acct_1234']);
+        $concert = \ConcertFactory::createPublished([
+            'ticket_price' => 3250,
+            'ticket_quantity' => 3,
+            'user_id' => $user,
+        ]);
 
         $this->orderTickets($concert, [
             'email' => 'john@example.com',
@@ -81,7 +87,7 @@ class PurchaseTicketsTest extends TestCase
             ]
         ]);
 
-        $this->assertEquals(9750, $this->paymentGateway->totalCharges());
+        $this->assertEquals(9750, $this->paymentGateway->totalChargesFor('test_acct_1234'));
         $this->assertTrue($concert->hasOrderFor('john@example.com'));
 
         $order = $concert->ordersFor('john@example.com')->first();
diff --git a/tests/Unit/Billing/FakePaymentGatewayTest.php b/tests/Unit/Billing/FakePaymentGatewayTest.php
index 81bc466..bbe1b09 100644
--- a/tests/Unit/Billing/FakePaymentGatewayTest.php
+++ b/tests/Unit/Billing/FakePaymentGatewayTest.php
@@ -14,6 +14,18 @@ class FakePaymentGatewayTest extends TestCase
         return new FakePaymentGateway;
     }
 
+    /** @test */
+    function can_get_total_charges_for_a_specific_account()
+    {
+        $paymentGateway = new FakePaymentGateway;
+
+        $paymentGateway->charge(1000, $paymentGateway->getValidTestToken(), 'test_acct_0000');
+        $paymentGateway->charge(2500, $paymentGateway->getValidTestToken(), 'test_acct_1234');
+        $paymentGateway->charge(4000, $paymentGateway->getValidTestToken(), 'test_acct_1234');
+
+        $this->assertEquals(6500, $paymentGateway->totalChargesFor('test_acct_1234'));
+    }
+
     /** @test */
     function running_a_hook_before_the_first_charge()
     {
diff --git a/tests/Unit/Billing/PaymentGatewayContractTests.php b/tests/Unit/Billing/PaymentGatewayContractTests.php
index 0f0f324..68b478d 100644
--- a/tests/Unit/Billing/PaymentGatewayContractTests.php
+++ b/tests/Unit/Billing/PaymentGatewayContractTests.php
@@ -26,10 +26,11 @@ trait PaymentGatewayContractTests
     {
         $paymentGateway = $this->getPaymentGateway();
 
-        $charge = $paymentGateway->charge(2500, $paymentGateway->getValidTestToken($paymentGateway::TEST_CARD_NUMBER));
+        $charge = $paymentGateway->charge(2500, $paymentGateway->getValidTestToken($paymentGateway::TEST_CARD_NUMBER), 'test_acct_1234');
 
         $this->assertEquals(substr($paymentGateway::TEST_CARD_NUMBER, -4), $charge->cardLastFour());
         $this->assertEquals(2500, $charge->amount());
+        $this->assertEquals('test_acct_1234', $charge->destination());
     }
 
     /** @test */