> For the complete documentation index, see [llms.txt](https://payum.gitbook.io/payum/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://payum.gitbook.io/payum/offline/get-it-started.md).

# Get Started

In this chapter we are going to talk about offline payments. The offline may be used in case of cash, cheque or wire transfer. We assume you already read basic [get it started](/payum/get-it-started.md). Here we just show you modifications you have to put to the files shown there.

### Installation

The preferred way to install the library is using [composer](http://getcomposer.org/). Run composer require to add dependencies to *composer.json*:

```bash
php composer.phar require payum/offline php-http/guzzle7-adapter
```

### config.php

We have to only add the gateway factory. All the rest remain the same:

```php
<?php
//config.php

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

/** @var Payum $payum */
$payum = (new PayumBuilder())
    ->addGateway('gatewayName', [
        'factory' => 'offline',
    ])

    ->getPayum()
;
```

### prepare.php

Here you have to modify a `gatewayName` value. Set it to `offline`. The rest remain the same as described in basic [get it started](/payum/get-it-started.md) documentation.

***

### Supporting Payum

Payum is an MIT-licensed open source project with its ongoing development made possible entirely by the support of community and our customers. If you'd like to join them, please consider:

* [Become a sponsor](https://github.com/sponsors/Payum)