added transaction number interface

app/Interfaces/Utility/TransactionNumber.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Interfaces\Utility;
+
+use App\Models\Common\Contact;
+
+interface TransactionNumber
+{
+    public function getNextNumber(string $type, string $suffix, ?Contact $contact): string;
+
+    public function increaseNextNumber(string $type, string $suffix, ?Contact $contact): void;
+}