first upload all files

Modules/Payment/Gateways/Flutterwave.php

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+<?php
+
+namespace Modules\Payment\Gateways;
+
+use Exception;
+use Illuminate\Http\Request;
+use Modules\Order\Entities\Order;
+use Modules\Payment\GatewayInterface;
+use Modules\Payment\Responses\FlutterwaveResponse;
+use Modules\Payment\Responses\InstamojoResponse;
+use stdClass;
+
+class Flutterwave implements GatewayInterface
+{
+    public $label;
+    public $description;
+
+    public const SUPPORTED_CURRENCIES = ['GBP', 'CAD', 'XAF', 'CLP', 'COP', 'EGP', 'EUR', 'GHS', 'GNF', 'KES', 'MWK', 'MAD', 'NGN', 'RWF', 'SLL', 'STD', 'ZAR', 'TZS', 'UGX', 'USD', 'XOF', 'ZMW'];
+    public const PAYMENT_OPTIONS = ['credit', 'ussd', 'nqr', 'barter', 'mobilemoneyzambia', 'mobilemoneyrwanda', 'mobilemoneyuganda', 'mobilemoneyfranco', 'mobilemoneyghana', 'mpesa', 'banktransfer', 'account', 'card'];
+
+    public function __construct()
+    {
+        $this->label = setting('flutterwave_label');
+        $this->description = setting('flutterwave_description');
+    }
+
+    public function purchase(Order $order, Request $request)
+    {
+        if (!in_array(currency(), self::SUPPORTED_CURRENCIES)) {
+            throw new Exception(trans('payment::messages.currency_not_supported'));
+        }
+
+        $response = new stdClass();
+        $response->public_key = setting('flutterwave_public_key');
+        $response->currency = currency();
+        $response->order_id = $order->id;
+        $response->amount = $order->total->convertToCurrentCurrency()->amount();
+        $response->tx_ref = 'ref' . time();
+        $response->payment_options = self::PAYMENT_OPTIONS;
+        $response->redirect_url = $this->getRedirectUrl($order);
+
+        return new FlutterwaveResponse($order, $response);
+    }
+
+    private function getRedirectUrl($order)
+    {
+        return route('checkout.complete.store', ['orderId' => $order->id, 'paymentMethod' => 'flutterwave']);
+    }
+
+    public function complete(Order $order)
+    {
+        return new FlutterwaveResponse($order, request()->all());
+    }
+}