Welcome to the community. Yes! But it depends on which POS system you are using. Some are more integrated than others. QuickBooks has it's own dedicated POS system, but there are many options available.
The way most external integrations like Square work is all the transactions are processed on the Square-side and then the data is ported automatically into QuickBooks.
Allow me to loop in and share information where you can find help in integrating you QuickBooks Point of Sales with Revel.
Integrations from third party providers such as Revel are best handled by their support. I recommend contacting Revel's technical support for they have the tools that will help and guide you through the whole integration process.
I've also got some resources that'l help you learn more about POS in QuickBooks: