http://dys2pwwos5w5kez2chufdk3b3oyj5n4n4iiseyke2tzuqahgvmovloyd.onion/en/2022-07-15-btcpay-bug.html
Because crypto exchange rates vary, BTCPay Server takes the Euro amount, obtains the current exchange rate from the crypto exchange Kraken and creates an invoice for the corresponding crypto currency amount. BTCPay Server 1.6.0 introduced a bug which inverted some altcoin exchange rates obtained from Kraken.