Binding an instance of a class into the service container

Say I want to use the Omnipay php library in my Laravel app. The docs say to use the basic usage is as follows:

// Create a gateway for the Stripe Gateway
// (routes to GatewayFactory::create)
$gateway = Omnipay::create('Stripe');
// Initialise the gateway
$gateway->initialize(array(
    'apiKey' => 'MyApiKey',
));
// Do a purchase transaction on the gateway
$transaction = $gateway->purchase(array(
    'amount'                   => '10.00',
    'currency'                 => 'USD',
    'card'                     => $card,
));
// etc

The thing is, the process of instantiating a Stripe version of Omnipay and setting the Api key is one which I'd like to avoid doing in the controller.

Is this something I can do in a Service Provider and then just resolve it out of the IoC container. E.g.

// OrdersController.php

/**
 * Create a new order
 * @param  GatewayInterface $gateway Some sort of Gateway??? 
 * Probably the GatewayInterface that comes in omnipay/common
 */
public function store(GatewayInterface $gateway)
{
    // create the order, get card details etc...
    $gateway->purchase(
        //...
    );

    // etc
}

So my Gateway is automatically injected into the controller method as a Stripe instance with Api key already set.

How would my service provider do this?