We use stripe to accept credit card payments and they charge 1.75% + $0.30 for domestic cards 2.9% + $0.30

for International cards. Many of the other apps we used to use before changing to Zoho (Xero, Quickbooks, ServiceM8) allow us to choose to automatically on-charge this fee to our customers automatically if they choose to pay by card, however Zoho does not. This would be an invaluable feature for not just us but I'm sure a lot of people in the Zoho Community.