The Business::OnlinePayment modules are where you want to start with but each gateway does things slightly different. Business::OnlinePayment does it's best to abstract those diffs away.
As for testing, once you have a gateway account established, they should provide a way to test offline I know authorize.net does.
In reply to Re: Daemon to test credit-card authorization?
by derby
in thread Daemon to test credit-card authorization?
by locked_user sundialsvc4
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