View file File name : TestHelper.php Content :<?php session_start(); require_once("vendor/autoload.php"); if(file_exists(__DIR__ . "/../.env")) { $dotenv = new Dotenv\Dotenv(__DIR__ . "/../"); $dotenv->load(); } Braintree\Configuration::environment(getenv('BT_ENVIRONMENT')); Braintree\Configuration::merchantId(getenv('BT_MERCHANT_ID')); Braintree\Configuration::publicKey(getenv('BT_PUBLIC_KEY')); Braintree\Configuration::privateKey(getenv('BT_PRIVATE_KEY'));