add back missing codes from - update payment and billings documents

app/Classes/Modules/Documents/Services/UpdatesDocumentReference.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Classes\Modules\Documents\Services;
+
+use App\Classes\General\Eloquent\AbstractUpdateRecord;
+use App\Models\Document;
+
+class UpdatesDocumentReference extends AbstractUpdateRecord
+{
+
+    /**
+     * @param Document $model
+     * @return mixed
+     */
+    public function execute(Document $model, string $reference) {
+        $model->reference = $reference;
+        return $this->handler($model);
+    }
+
+}