Move dynamic segments from Premium plugin

[MAILPOET-2382]

lib/API/JSON/v1/NewsletterLinks.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace MailPoet\Premium\API\JSON\v1;
+
+use MailPoet\API\JSON\Endpoint as APIEndpoint;
+use MailPoet\Config\AccessControl;
+use MailPoet\Models\NewsletterLink;
+
+class NewsletterLinks extends APIEndpoint {
+
+  public $permissions = [
+    'global' => AccessControl::PERMISSION_MANAGE_SEGMENTS,
+  ];
+
+  function get($data = []) {
+    $links = NewsletterLink::select(['id', 'url'])->where('newsletter_id', $data['newsletterId'])->findArray();
+    return $this->successResponse($links);
+  }
+
+}