Call to undefined method Illuminate\Foundation\Application::configure() in ~/src/bootstrap/app.php

I try to use OmniPay in my Laravel 5.2 project by adding the following line in my composer.json

"ignited/laravel-omnipay": "2.*",
"lokielse/omnipay-alipay": "dev-master"

Then after I add the following line in bootstrap/app.php line 46,

$app->configure('laravel-omnipay');

and create a new controller, I hit error

PHP Fatal error:  Call to undefined method Illuminate\Foundation\Application::configure() in /home/xxx/src/bootstrap/app.php on line 46

Any idea will be welcomed. Thanks!

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