first upload all files

Modules/Currency/Config/assets.php

@@ -0,0 +1,21 @@
+<?php
+
+return [
+    /*
+    |--------------------------------------------------------------------------
+    | Define which assets will be available through the asset manager
+    |--------------------------------------------------------------------------
+    | These assets are registered on the asset manager
+    */
+    'all_assets' => [
+        'admin.currency.js' => ['module' => 'currency:admin/js/currency.js'],
+    ],
+
+    /*
+    |--------------------------------------------------------------------------
+    | Define which default assets will always be included in your pages
+    | through the asset pipeline
+    |--------------------------------------------------------------------------
+    */
+    'required_assets' => [],
+];

Modules/Currency/Config/config.php

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+<?php
+
+return [
+    'services' => [
+        'array' => ['latest_rates' => []],
+        'fixer' => ['access_key' => env('FIXER_ACCESS_KEY')],
+        'forge' => ['api_key' => env('FORGE_API_KEY')],
+        'currency_data_feed' => ['api_key' => env('CURRENCY_DATA_FEED_API_KEY')],
+    ],
+];

Modules/Currency/Config/permissions.php

@@ -0,0 +1,8 @@
+<?php
+
+return [
+    'admin.currency_rates' => [
+        'index' => 'currency::permissions.index',
+        'edit' => 'currency::permissions.edit',
+    ],
+];