fix: MemberCase

ReferralType
* Convert ReferralType in class to an Enum

src/Enums/Case/ReferralType.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace App\Enums\Case;
+
+enum ReferralType: string
+{
+    case DCS = 'DCS';
+    case PO = 'PO';
+}