Merge pull request #167 from anush/gateway_version

Allow configuring `Stripe-Version` at the gateway level

Author: barryvdh

src/AbstractGateway.php

@@ -107,6 +107,7 @@ public function getDefaultParameters()
     {
         return array(
             'apiKey' => '',
+            'stripeVersion' => null
         );
     }
 
@@ -150,6 +151,24 @@ public function setApiKey($value)
         return $this->setParameter('apiKey', $value);
     }
 
+    /**
+     * @return string
+     */
+    public function getStripeVersion()
+    {
+        return $this->getParameter('stripeVersion');
+    }
+
+    /**
+     * @param string $value
+     *
+     * @return Gateway
+     */
+    public function setStripeVersion($value)
+    {
+        return $this->setParameter('stripeVersion', $value);
+    }
+
     /**
      * Authorize Request.
      *