@brudgers thank you for your points. We are integrating with PayPal, Payoneer and Stripe. We do interfere with the transactions.
We do not charge any transaction fees. It is up to the PayPal, Payoneer and Stripe to define their transaction fees for your account.
Regarding your data, we are hosting the service on Windows Azure. Database is encrypted and backup on daily basis.
Let me know if you have any questions.
Kindest regards,
Marjan, Founder of Envoice