Stripe is a global leader in payment processing. 90% of US adults have bought a product using Stripe and they support over 135 currencies.
TutorCruncher and Stripe are a match made in heaven, TutorCruncher handles client management, scheduling and invoicing, Stripe then makes it easy to take payment from their account.
In combination, TutorCruncher can automatically take payment from saved card details whenever a charge is issued and match any pre-existing customer accounts you have stored in Stripe, so none of your clients, so nobody needs to enter their details twice when you switch over to TC.