[quote name='iRandom']I used the $15 coupon but on my paypal statement, I was charged -$43.49 USD
I bought the 4k MSP
Is this right?[/QUOTE]
Make sure to check your paypal receipt. If you did the groupon thing say, a few times (cough), you'll see $0.00 USD as the amount under "Total" and "Payment" meaning your paypal charge was entirely funded by the ebay giftcard. Of course, if you used one ebay code only then your total and payment amount should be whatever the full charge was minus the amount of the ebay code.
Edit: noone13 beat me to the punch with a more succinct explanation. Yep, you can check your paypal account and then details for the transaction to confirm.