Start from envelope Django template

core/templates/success.html

@@ -0,0 +1,11 @@
+{% extends "base.html" %}
+
+{% block content %}
+  <h1 class="title">XF</h1>
+  <div class="container">
+    <h2 class="subtitle">Thank you for your order!</h2>
+    <div class="col">
+      <h2 class="subtitle">The customer portal will be available <a href="{% url 'billing' %} ">in your profile</a> shortly.</h2>
+    </div>
+  </div>
+{% endblock %}