Expost json api endpoint

[PREMIUM-213]

mailpoet/lib/AdminPages/Pages/AutomationEditor.php

@@ -89,6 +89,9 @@ class AutomationEditor {
         'root' => rtrim($this->wp->escUrlRaw($this->wp->restUrl()), '/'),
         'nonce' => $this->wp->wpCreateNonce('wp_rest'),
       ],
+      'jsonapi' => [
+        'root' => rtrim($this->wp->escUrlRaw(admin_url('admin-ajax.php')), '/'),
+      ],
       'user_roles' => $roles->get_names(),
       'segments' => $segments,
     ]);

mailpoet/views/automation/editor.html

@@ -7,6 +7,7 @@
 <% block after_javascript %>
 <script type="text/javascript">
   var mailpoet_automation_api = <%= json_encode(api) %>;
+  var mailpoet_json_api = <%= json_encode(jsonapi) %>;
   var mailpoet_user_roles = <%= json_encode(user_roles) %>;
   var mailpoet_segments = <%= json_encode(segments) %>;
   var mailpoet_automation_context = <%= json_encode(context) %>;