Payment Example Draft Code

PaymentController.php

<?php

/**
* Catch gateway-triggered requests
*/
class PaymentController extends Controller{

    function init(){
        $this->processor = $this->getProcessorForPayment(); //somehow get the right processor to continue handling
        //Perhaps the processor class is sent in the url, eg: mysite/paymentcontrol/PayPal/?extradata=....
    }

    function success($request){
        $response = $this->processor->handleGatewayResponse($request); //creates a new Paypal_Response object to parse body of request
        $payment->updateStatus($response->getStatus());

        //redirect to somewhere? perhaps originalcontroller->Link('success') ??
    }

}

PaymentPage.php

<?php

//processing occurring within a controller
class PaymentPage_Controller extends Page_Controller{

    function index(){
        
        //payment is a dataobject of it's own
        $payment = new Payment();
        $payment->setAmount(10,'NZD');
        $payment->write();
        
        //processor is a class of it's own, not inheriting from anything - borrowing heavily from active merchant architecture
        $processor = new PaypalProcessor_Test($apikey = "AHSE#N$KAGKAEGAWEFGAS",$username = "BLAH"); //PaypalProcessor_Test extends PaypalProcessor, and subsequently PaymentProcessor
        $processor->setPayment($payment); //extracts amount, currency, ID. May also be used to store data (but that's coupling processor to model :S)
        $processor->setData(array( //set any extra data that might be needed, field names are standardized because of pre-defined mapping in the processor.
             'street' => '4 Macarini Street',
             'city' => '5 blah street'
        ));
        $processor->validate(); //has the processor got everything it needs
        //authorize, capture, void?
        $processor->process(); //either performs payment, or triggers redirect?

    }

}