Click here to setup braintree in laravel
<?php
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namespace App\Http\Controllers;
use App\Http\Controllers\Controller;
use Auth;
use Illuminate\Support\Facades\Input;
use Braintree_Transaction;
use Braintree_Customer;
use Braintree_WebhookNotification;
use Braintree_Subscription;
use Braintree_CreditCard;
class PaymentController extends Controller { ...