Hello, Unfortunately, I try to sign up and buy my ticket for this year's conference and I can not. When I was trying to buy the ticket from the mastercard card from «National Bank of Greece» ( https://www.nbg.gr/en ) Returns the following error : "The card was declined" But when I put my Revolut card details, the purchase was successful! Why is this happening ; Is there a problem on the page? Is there a problem with Greek banks? Let me note, this is the first time when I have an online purchases problem with my card ( of «National Bank of Greece» ). I have made too many online purchases with this card and I have never had a problem. I am at your disposal if I can help! I hope the best for this year's conference!! :) -- Kind regards, Anastasios Lisgaras Open Source Software Engineer. Cell phone: +30 69 55 83 17 92 Keybase: https://keybase.io/tas_sos GnuPG Fingerprint: 5003 03E8 CA50 1878 06D9 3AEA FC25 8330 FE34 8E41
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