how to override the file paypal\paypal_orders.php?

[Jorbel]

module: https://github.com/PrestaShop/paypal

I'm trying to override the class PayPalOrder (paypal\paypal_orders.php), I copied the entire file to
\override\modules\paypal\paypal_orders.php

I renamed the class in this way:

class PayPalOrderOverride extends PayPalOrder { .... }

and I modified the content of the function
public static function getTransactionDetails($ppec = false, $payment_status = false);

because I got an error: PHP Notice: Undefined index: PAYMENTREQUEST_0_SHIPPINGAMT
when I try to confirm a payment using Paypal.
Alter that, I removed all cache directory content but it doesn't work.

what should I do to override this class?

[tdsoft]

Prestashop only allow override a classes, controller from Prestashop's Core

you can NOT override class, controller from a module

[JBW]

Sure you can override module classes, check http://build.prestashop.com/howtos/module/how-to-override-modules/

Guess the error posted above is caused by some code inside your function override.

[joseantgv]

You can only override MAIN module class, in this case Paypal (paypal/paypal.php).

Check this: 

 

[JBW]

Thanks @joseantgvThats correct, only main class. Maybe @Jorbel can explain what he wants to achieve with his override!?

[Jorbel]

Thanks guys, I just was trying to put this code:

if (!isset($ppec->result['PAYMENTREQUEST_0_SHIPPINGAMT'])) {
     $ppec->result['PAYMENTREQUEST_0_SHIPPINGAMT'] = 0;
}

inside the getTransactionDetails function because I got an error when tried to do a Payment using Paypal.