Canadian Credit Card Question

ZanteSoul - Heavens Tear

The very first time I added money to PWI was with an Ultimate Game Card. When I went to use the card, it charged me a service fee or exchange rate cost or something, I'm not entirely sure what it was. When it did this, I could only load $10 on the card and then leave the remaining on my Ultimate Game Card account for future use. Lately, I've been thinking about using Pre-Paid Visa giftcards instead. My question is: If I were to purchase a $50 Gift Card and load it all onto PWE, would PWI charge me another dollar or so for a service fee/exchange rate/whatever?