163 - Total Charges for a Specific Account

app/Billing/Charge.php

@@ -20,4 +20,9 @@ class Charge
     {
         return $this->data['card_last_four'];
     }
+
+    public function destination()
+    {
+        return $this->data['destination'];
+    }
 }

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;

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);