[12.x] Allow model swapping

src/Cashier.php

@@ -52,6 +52,20 @@ class Cashier
      */
     public static $deactivatePastDue = true;
 
+    /**
+     * The subscription model class name.
+     *
+     * @var string
+     */
+    public static $subscriptionModel = Subscription::class;
+
+    /**
+     * The subscription item model class name.
+     *
+     * @var string
+     */
+    public static $subscriptionItemModel = SubscriptionItem::class;
+
     /**
      * Get the billable entity instance by Stripe ID.
      *
@@ -153,4 +167,26 @@ public static function keepPastDueSubscriptionsActive()
 
         return new static;
     }
+
+    /**
+     * Set the subscription model class name.
+     *
+     * @param  string  $subscriptionModel
+     * @return void
+     */
+    public static function useSubscriptionModel($subscriptionModel)
+    {
+        static::$subscriptionModel = $subscriptionModel;
+    }
+
+    /**
+     * Set the subscription item model class name.
+     *
+     * @param  string  $subscriptionItemModel
+     * @return void
+     */
+    public static function useSubscriptionItemModel($subscriptionItemModel)
+    {
+        static::$subscriptionItemModel = $subscriptionItemModel;
+    }
 }

src/Concerns/ManagesSubscriptions.php

@@ -2,6 +2,7 @@
 
 namespace Laravel\Cashier\Concerns;
 
+use Laravel\Cashier\Cashier;
 use Laravel\Cashier\Subscription;
 use Laravel\Cashier\SubscriptionBuilder;
 
@@ -102,7 +103,7 @@ public function subscription($name = 'default')
      */
     public function subscriptions()
     {
-        return $this->hasMany(Subscription::class, $this->getForeignKey())->orderBy('created_at', 'desc');
+        return $this->hasMany(Cashier::$subscriptionModel, $this->getForeignKey())->orderBy('created_at', 'desc');
     }
 
     /**

src/Subscription.php

@@ -91,7 +91,7 @@ public function owner()
      */
     public function items()
     {
-        return $this->hasMany(SubscriptionItem::class);
+        return $this->hasMany(Cashier::$subscriptionItemModel);
     }
 
     /**

src/SubscriptionItem.php

@@ -40,7 +40,7 @@ class SubscriptionItem extends Model
      */
     public function subscription()
     {
-        return $this->belongsTo(Subscription::class);
+        return $this->belongsTo(Cashier::$subscriptionModel);
     }
 
     /**