I just noticed paypal started converting currency for me also, started beginning of november 2016. I have always used my cc for conversion, so i checked my mail archive and last time paypal converted for me was once in 2012 and 2009. Now suddenly they have started to silently convert some purchases. I did check https://www.paypal.com/us/cgi-bin/webscr?cmd=_profile-merchant-pull-funding and cc is still set correctly. Now i have used a currency converter to find correct rates for the dates and have overpaid on all those transactions.
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