New payment method

[vysser]

Hi, I'm trying to implement a new paying method, but I have a few doubts:

The payment gateway API sends the confirmation of the payment to "report.php", but how is "check_payment.php" called?

The gateway also asks for a "url_ok" and a "url_ko" pages, to send the client after the transaction. Is it this way that "view_confirmation.php" is trigggered?

Is there a way of knowing exactly the actual url of each step of the process (I mean not seeing just a SEO friendly url)?

Thank you