At each match you can use your AMKA and the fan / friend / member card number in order to purchase a single ticket, as these numbers are personal to each fan.
If you try to use them to buy an extra ticket, your order will not proceed.
In case you have placed an order which for some reason was unsuccessful (eg network outage, low internet speed, untimely approval of the transaction set by the bank, incomplete card amount, etc.) it will take 15 minutes for the system to release the AMKA and the fan card number so that you can use them again in a new order.