For each Invoice2go payment transaction, a fee will be deducted from the amount your customer pays you.
Payments fees for the United States include 2.9% + 30¢ per transaction paid with a debit or credit card. When accepting payments from international cards, including American Express, international fees are the same as domestic, 2.9% + 30¢ per transaction.
Stripe collects all payment transaction fees. You can see all collected fees from your Stripe dashboard.