Hello Emaraujo
The conversion 63 EUROS to 100 USD was not made by us but instead made by your bank in USA.
The VISA system just send an order to your bank to buy the ticket but its your bank that makes the conversion. We don't have any action in that process.
You should ask your bank why was so expensive.
Please if you need any further information contact me to
feedback@paredesdecoura.combest regards