first upload all files

Modules/Payment/Gateways/Paystack.php

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+<?php
+
+namespace Modules\Payment\Gateways;
+
+use stdClass;
+use Exception;
+use Illuminate\Http\Request;
+use Modules\Order\Entities\Order;
+use Modules\Payment\GatewayInterface;
+use Modules\Payment\Responses\InstamojoResponse;
+use Modules\Payment\Responses\PaystackResponse;
+
+class Paystack implements GatewayInterface
+{
+    public $label;
+    public $description;
+
+    const SUPPORTED_CURRENCIES = ['NGN', 'GHS', 'USD', 'ZAR'];
+
+    public function __construct()
+    {
+        $this->label = setting('paystack_label');
+        $this->description = setting('paystack_description');
+    }
+
+    public function purchase(Order $order, Request $request)
+    {
+        if (!in_array(currency(), self::SUPPORTED_CURRENCIES)) {
+            throw new Exception(trans('payment::messages.currency_not_supported'));
+        }
+
+        return new PaystackResponse($order, $request);
+    }
+
+    public function complete(Order $order)
+    {
+        return new PaystackResponse($order, request());
+    }
+}