diff --git a/src/VendAuth.php b/src/VendAuth.php
new file mode 100644
index 0000000..c6b37f0
--- /dev/null
+++ b/src/VendAuth.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace SimpleSquid\Vend;
+
+class VendAuth extends VendConnector
+{
+    public function resolveBaseUrl(): string
+    {
+        if (is_null($this->domainPrefix)) {
+            return 'https://secure.vendhq.com';
+        }
+
+        return "https://{$this->domainPrefix}.vendhq.com/api";
+    }
+}