Payment gateways

[eluser]Tominator[/eluser]
I'm sorry I was wrong. You have rewrite it, when you want to extend existing or rewrite default.

But everything what you need is copy it to:
[root]/system/application/libraries/

They have to have the same name as is class name, that means:

Correct one:
Paypal.php

Code:

class Paypal {
...
}

Wrong:
Paypal.php

Code:

class Paypal_ThisMusntBeThere {
...
}

Tom.