first upload all files

Modules/Currency/Providers/CurrencyExchangeRateServiceProvider.php

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+<?php
+
+namespace Modules\Currency\Providers;
+
+use Swap\Builder;
+use Illuminate\Support\ServiceProvider;
+use Modules\Currency\Services\CurrencyRateExchanger;
+
+class CurrencyExchangeRateServiceProvider extends ServiceProvider
+{
+    /**
+     * Bootstrap any application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        if (! config('app.installed')) {
+            return;
+        }
+
+        $this->setupCurrencyRateExchangeService();
+
+        $this->app->singleton(CurrencyRateExchanger::class, function () {
+            $service = setting('currency_rate_exchange_service', 'array');
+            $options = config("fleetcart.modules.currency.config.services.{$service}");
+
+            $swap = (new Builder)->add($service, $options)->build();
+
+            return new CurrencyRateExchanger($swap);
+        });
+    }
+
+    /**
+     * Setup currency rate exchange service.
+     *
+     * @return void
+     */
+    private function setupCurrencyRateExchangeService()
+    {
+        config([
+            'fleetcart.modules.currency.config.services.fixer.access_key' => setting('fixer_access_key'),
+            'fleetcart.modules.currency.config.services.forge.api_key' => setting('forge_api_key'),
+            'fleetcart.modules.currency.config.services.currency_data_feed.api_key' => setting('currency_data_feed_api_key'),
+        ]);
+    }
+}

Modules/Currency/Providers/CurrencyServiceProvider.php

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+<?php
+
+namespace Modules\Currency\Providers;
+
+use Modules\Support\Traits\AddsAsset;
+use Illuminate\Support\ServiceProvider;
+use Modules\Admin\Ui\Facades\TabManager;
+use Illuminate\Console\Scheduling\Schedule;
+use Modules\Currency\Admin\CurrencyRateTabs;
+use Modules\Currency\Console\RefreshCurrencyRatesCommand;
+
+class CurrencyServiceProvider extends ServiceProvider
+{
+    use AddsAsset;
+
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        if (! config('app.installed')) {
+            return;
+        }
+
+        TabManager::register('currency_rates', CurrencyRateTabs::class);
+
+        $this->addAdminAssets('admin.currency_rates.index', ['admin.currency.js']);
+
+        if ($this->app->runningInConsole() && setting('auto_refresh_currency_rates', false)) {
+            $this->commands(RefreshCurrencyRatesCommand::class);
+
+            $this->registerScheduler();
+        }
+    }
+
+    private function registerScheduler()
+    {
+        $this->app->booted(function ($app) {
+            $frequency = setting('auto_refresh_currency_rate_frequency');
+
+            if (in_array($frequency, ['daily', 'weekly', 'monthly'])) {
+                $app[Schedule::class]->command(RefreshCurrencyRatesCommand::class)->{$frequency}();
+            }
+        });
+    }
+}

Modules/Currency/Providers/EventServiceProvider.php

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+<?php
+
+namespace Modules\Currency\Providers;
+
+use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
+
+class EventServiceProvider extends ServiceProvider
+{
+    /**
+     * The event listener mappings for the application.
+     *
+     * @var array
+     */
+    protected $listen = [
+        \Modules\Setting\Events\SettingSaved::class => [
+            \Modules\Currency\Listeners\CreateCurrencyRates::class,
+        ],
+    ];
+}