Receiving payments from iTunes - are there foreign currency exchange fees?
No. You will be paid by units sold. Let's see an example:

You sold 100 apps with a price of 1 CAD.

You will get 0.7 CAD per app sold x 100 units.

Total 70.0 CAD.

If some of your sales are on foreign country, the process is the same, except currency exchange applied is the payment's day exchange, without fees.

This quoted text is from iTunes Connect Payments and Financial Reports:


  This amount is only an estimate. Actual amount may vary, based on
  foreign exchange rates. Amount shown does not include any applicable
  withholding tax, which will be applied when the payment is made.