Ejemplo de instalación de Culqi en Laravel 5.4

composer.json

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.6.4",
        "laravel/framework": "5.4.*",
        "laravel/tinker": "~1.0",
        "culqi/culqi-php": "1.3.3"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~5.7"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true
    }
}

PaymentController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use Culqi\Culqi;


class PaymentController extends Controller
{


  protected function index()
  {
    try {
      $SECRET_KEY = "<< Aqui tu llave secreta >>";
      $culqi = new Culqi(array('api_key' => $SECRET_KEY));
      //dd($_POST["token"]);
      $charge = $culqi->Charges->create(
        array(
          "amount" => 200,
          "currency_code" => "PEN",
          "email" => "prueba@culqi.com",
          "source_id" => "<< Aqui un token, generado por Culqi Checkout >>",
          "antifraud_details" => array(
            "address" =>"Calle Narciso de la Colina",
            "address_city"=> "Lima",
            "country_code" => "PE",
            "first_name" => "Liz",
            "last_name" => "Ruelas",
            "phone_number" => 123456789
          )
        )
      );
      //dd($charge);
      echo "ok";
    } catch (Exception $e) {
      echo json_encode($e->getMessage());
    }

  }



}

web.php

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');

});



// Prueba de Culqi

Route::get('payment', 'PaymentController@index');