Hello Vasi, it is certainly possible by bank transfer within Greece, but I'm not into banking and I have no idea if it's possible from abroad as well. Normally yes? Hm.. You can send them an email here: firstname.lastname@example.org
or call +30 211 7700 000.
In any case, here is what you have to do on the site:
On step 4) above, under the blue title Πληρωμή
it says Πιστωτική κάρτα and Τράπεζα
(bank). You click on that tab. Then you check the box Αποδέχομαι τους Όρους Χρήσης
(I agree to the terms) and click on Κράτηση
Now you have booked a ticket for 24 hours; but it is only yours when you do transfer the money (within 24 hours). Otherwise the booking is cancelled.
So, when you click on κράτηση it takes you to a list of the banks that cooperate, and on top of the bank list it gives you a code
of electronical payment, in big red numbers. You give that code in the bank. Also in red it says that you have to give in "Viva Payments
" when you are asked for what kind of payment you want. You get an email from them too, with a link that takes you to that page with the code.
Then you have to transfer the money to the bank you prefer, by e-banking for example.
Don't ask me if it's possible to do it from abroad, I know nothing.
Hm, because I followed those steps myself to find out, now I booked myself a ticket until tomorrow.