add transformer for underline raw data

app/Repositories/Import/Quickbooks/Transformers/Transformer.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Repositories\Import\Quickbooks\Transformers;
+
+use Illuminate\Support\Collection;
+
+class Transformer
+{
+    public function transform(array $items, string $type): Collection
+    {
+        if(!method_exists($this, ($method = "transform{$type}s"))) throw new \InvalidArgumentException("Unknown type: $type");
+
+        return call_user_func([$this, $method], $items);
+    }
+
+    protected function transformInvoices(array $items): Collection
+    {
+        return $this->transformation($items, []);
+    }
+
+    protected function transformCustomers(array $items): Collection
+    {
+        return $this->transformation($items, [
+            'CompanyName',
+            'PrimaryPhone',
+            'BillAddr',
+            'ShipAddr',
+            'Notes',
+            'GivenName',
+            'FamilyName',
+            'PrimaryEmailAddr',
+            'CurrencyRef',
+            'MetaData'
+        ]);
+    }
+
+    protected function transformation(array $items, array $keys) : Collection
+    {
+        return collect($items)->select($keys);
+    }
+
+}