When you start the purchasing process, the game shows what packages or offers are available. Usually, these are shown in US Dollars. Once you have selected an offer, the payment processor will show the total amount in the local currency based on your location. 

If you are seeing a different currency than you expected, this can be due to the location being incorrectly set. Check with your bank, PayPal or other payment method that they have the correct location listed. You may need to reach out to their support team for assistance.