Typically if you pay with your credit/debit card the transaction is drawn from your account in your local currency but credited to the seller in the transaction currency. Therefore the card organization's exchange rate and possibly other exchange charge is applied. In some cases, if you have a card which is opened in yet another currency, you might have two separate exchange rates applied to the transaction. One from the "source" currency to the card currency and another from the card currency to "destination" currency".
The main payment option is indeed the card payment but there are _sometimes_ some other options available like purchasing exam vouchers if you're a Splunk customer but they can be more difficult to execute and not available everywhere easily.
