You can pay the amount agreed using either one of the two (2) Bank Secure websites:
1) (using a PC or laptop) https://www.livepay.gr/astoriatravel-1.aspx The web page belongs to EUROBANK of Greece
or, 2) using any tool, you visit: https://astoriatravel.eu/shop/openpay.html The web page belongs to ALPHA BANK of Greece
Either one of the 2 websites is accepted and does the job. The moment that you finish the transaction, the bank sends you a message that the transaction was successful and at the same time sends me a message that you deposited the money and gives me the data that I need to find them. The message from the bank contains personal data. Please, do not attach it to a message and send it to me. You may print it for your own use and just tell me that you paid the money.