Thank you. Our Stripe integration works through OAuth aka Stripe Connect. Basically, you click the Connect with Stripe button, create an account or sign in, and then confirm that you want to give Invoiced access to your account. We then generate a payment form for your invoices that your customers can pay you with, i.e.
https://invoiced.com/username/cust_no/inv_no/payment. The payment goes directly to your Stripe account and we do not add any commission on top of Stripe's fee. This setup is ideal because you can revoke access from our service at any time and we only have access to your account through a unique token that Stripe provides us.
Our PayPal integration is even simpler. Just provide your e-mail address and we generate Pay via PayPal buttons for your invoices. Again, no commission.