Stripe is an available payment processor that integrates with Simplero.
To utilize Stripe you will need to set up your account with them and then connect it to your payment processors in your Simplero settings.
Once you have it connected it will be available for your customers to use.
Stripe will handle all $ received when a customer pays through them. If you need to refund the transaction you will hit the refund button in Simplero and Stripe will manage the actual movement of money back to the customer. If you have questions about why you have not received that money or how the money is being returned to the customer you will need to contact stripe.