Direct Bus

Q In which cases can I get a reduction?
Q How can I pay?
Q How can I pay if I haven't a PayPal account?
Q Can I change date or time of departure? How I can do it?
Q Are tickets refundable?
Q I missed the bus, what i can do?
Q What are the benefits of buying a DIRECT BUS ticket online?
Q Can I pick my seat when purchasing my ticket?