You can charge or refund the credit card that your guest used to make a reservation through the Odysys booking engine. You can also now add "offline" payments including cash, check or payment from 3rd parties like Expedia, BedandBreakfast.com, etc.
Note: Credit card payment functionality only works if you've connected your payment gateway (Stripe, Moneris, etc.) to the Odysys booking engine and the guest made the reservation with a credit card through the booking engine.
IMPORTANT: If you are cancelling the guest's reservation and you need to make a refund, do the refund in Odysys first and THEN cancel the reservation. Otherwise you'll have to login to Stripe to refund their card.
Here's the video on how to perform a transaction on the guest's credit card in the Odysys booking engine:
More information about Stripe: