Below is a copy of a complaint made on the Dublin Forum of Tripadvisor.com.
"i paid 374 eu for my 3 tix with ryan air (after all charges this was the amount on my receipt.)
@ the time the exchange rate stated that this should have been equal to $580 USD. when i get my credit card bill i was charged 615 USD.
so now i am in the middle of a dispute, as per VISA ryan air has rejected my claim with no kind of documentation and it is now up to me to provide further documentation to support my case.
VISA says that it is ryan air that implemented this conversion rate not VISA. i always thought the Credit Card company to to the conversion.
sorry if this is long and boring, and i know it's only $35 USD but i am mad!!!!!"
Does anyone know if it is Ryanair or the credit card company that do the currency conversion?