<?php
//config.php

use Payum\Core\PayumBuilder;
use Payum\Core\Payum;

/** @var Payum $payum */
$payum = (new PayumBuilder())
    ->addDefaultStorages()

    ->addGateway('gatewayName', [
        'factory' => 'tpay',
        'merchant_id'  => 'change it',
        'secret' => 'change it',
        'api_key'  => 'change it',
        'api_password' => 'change it',
        'sandbox'   => true,
    ])

    ->getPayum()
;