fixed #402

app/Providers/ValidationServiceProvider.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Providers;
+
+use App\Models\Setting\Currency;
+use Illuminate\Support\ServiceProvider;
+use Validator;
+
+class ValidationServiceProvider extends ServiceProvider
+{
+    /**
+     * Bootstrap any application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        $currency_code = null;
+
+        Validator::extend('currency', function ($attribute, $value, $parameters, $validator) use(&$currency_code) {
+                $status = false;
+
+                $currencies = Currency::enabled()->pluck('name', 'code')->toArray();
+
+                if (array_key_exists($value, $currencies)) {
+                    $status = true;
+                }
+
+                $currency_code = $value;
+
+                return $status;
+            },
+            trans('validation.custom.invalid_currency', ['attribute' => $currency_code])
+        );
+    }
+
+    /**
+     * Register any application services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+    }
+}