Load PaypalRest js via URL and cache code

Author: mattwire

Metadata/omnipay_PaypalRest.mgd.php

@@ -38,6 +38,9 @@
  * database as appropriate. For more details, see "hook_civicrm_managed" at:
  * http://wiki.civicrm.org/confluence/display/CRMDOC/Hook+Reference
  */
+
+use CRM_Omnipaymultiprocessor_ExtensionUtil as E;
+
 return array(
   array(
     'name' => 'PayPal Checkout',
@@ -100,8 +103,8 @@
         //'billing-block-post' => [],
         'billing-block' => [
           ['markup' => '<div id="paypal-button-container" class="crm-paypal-buttons"></div>', 'name' => 'paypal_button', 'weight' => 400],
-          ['name' => 'paypal_script', 'weight' => 500, 'script' => file_get_contents(__DIR__ . '/js/omnipay_PaypalRest.js')]
-         ],
+          ['name' => 'paypal_script', 'weight' => 500, 'scriptUrl' => \Civi::resources()->addCacheCode(E::url('Metadata/js/omnipay_PaypalRest.js'))]
+        ],
       ],
     ],
   ),