Add SubscriptionRequests trait.

src/Models/Subscription.php

@@ -4,9 +4,12 @@
 
 use Illuminate\Database\Eloquent\Model;
 use Payavel\Subscription\Database\Factories\SubscriptionFactory;
+use Payavel\Subscription\Models\Traits\SubscriptionRequests;
 
 class Subscription extends Model
 {
+    use SubscriptionRequests;
+
     /**
      * The attributes that aren't mass assignable.
      *

src/Models/Traits/ConfiguresSubscriptionGateway.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Payavel\Subscription\Models\Traits;
+
+use Payavel\Subscription\SubscriptionGateway;
+
+trait ConfiguresSubscriptionGateway
+{
+    /**
+     * The subscription's pre-configured gateway.
+     *
+     * @var \Payavel\Subscription\SubscriptionGateway
+     */
+    private $subscriptionGateway;
+
+    /**
+     * Retrieve the subscription's configured gateway.
+     *
+     * @return \Payavel\Subscription\SubscriptionGateway
+     */
+    public function getGatewayAttribute()
+    {
+        if (! isset($this->subscriptionGateway)) {
+            $this->subscriptionGateway = (new SubscriptionGateway)
+                ->provider($this->provider_id);;
+        }
+
+        return $this->subscriptionGateway;
+    }
+}

src/Models/Traits/SubscriptionRequests.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Payavel\Subscription\Models\Traits;
+
+trait SubscriptionRequests
+{
+    use ConfiguresSubscriptionGateway;
+
+    /**
+     * Fetch the Subscription details.
+     *
+     * @return \Payavel\Subscription\SubscriptionResponse
+     */
+    public function fetch()
+    {
+        return $this->gateway->getAgreement($this);
+    }
+}