first upload all files

Modules/Currency/Services/CurrencyRateExchanger.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Modules\Currency\Services;
+
+use Swap\Swap;
+use Exchanger\Exception\Exception;
+
+class CurrencyRateExchanger
+{
+    /**
+     * Instance of swap.
+     *
+     * @var \Swap\Swap
+     */
+    private $swap;
+
+    /**
+     * Create a new CurrencyRateExchanger instance.
+     *
+     * @param \Swap\Swap $swap
+     */
+    public function __construct(Swap $swap)
+    {
+        $this->swap = $swap;
+    }
+
+    /**
+     * Exchange to the latest currency rate.
+     *
+     * @param string $fromCurrency
+     * @param string $toCurrency
+     * @return float|null
+     */
+    public function exchange($fromCurrency, $toCurrency)
+    {
+        try {
+            return $this->swap->latest("{$fromCurrency}/{$toCurrency}")->getValue();
+        } catch (Exception $e) {
+            return 1;
+        }
+    }
+}