Thank you for your question. Currently the payment gateways are not a available in Hotel Booking plugin by default and we do not have this in our to-do list. We’ll keep your suggestion in mind though.
You can also check if these payment gateways are available for WooCommerce. If so you can get our addon that integrates payment gateways from WooCoommerce to Hotel Booking plugin – Hotel Booking WooCommerce Payments.