first upload all files

Modules/Payment/Gateways/Instamojo.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\InstamojoResponse;
+
+class Instamojo implements GatewayInterface
+{
+    public $label;
+    public $description;
+
+    public function __construct()
+    {
+        $this->label = setting('instamojo_label');
+        $this->description = setting('instamojo_description');
+    }
+
+    public function client()
+    {
+        $endpoint = setting('instamojo_test_mode') ? 'https://test.instamojo.com/api/1.1/' : null;
+
+        return new \Instamojo\Instamojo(setting('instamojo_api_key'), setting('instamojo_auth_token'), $endpoint);
+    }
+
+    public function purchase(Order $order, Request $request)
+    {
+        if (currency() !== 'INR') {
+            throw new Exception(trans('payment::messages.only_supports_inr'));
+        }
+
+        try {
+            $response = $this->client()
+                ->paymentRequestCreate([
+                    'purpose' => setting('store_name') . " payment for order #{$order->id}",
+                    'amount' => $order->total->convertToCurrentCurrency()->round()->amount(),
+                    'buyer_name' => $order->customer_full_name,
+                    'email' => $order->customer_email,
+                    'phone' => $order->customer_phone,
+                    'send_sms' => true,
+                    'redirect_url' => $this->getRedirectUrl($order),
+                    'allow_repeated_payments' => false,
+                ]);
+        } catch (Exception $e) {
+            throw new Exception(trim(trim($e->getMessage()), '"'));
+        }
+
+        return new InstamojoResponse($order, $response);
+    }
+
+    private function getRedirectUrl($order)
+    {
+        return route('checkout.complete.store', ['orderId' => $order->id, 'paymentMethod' => 'instamojo']);
+    }
+
+    public function complete(Order $order)
+    {
+        return new InstamojoResponse($order, request()->all());
+    }
+}