The app checkout button creates a case in GXP, which is a customised version of Salesforce CRM. GXP is also behind the requests buttons in the app, if you request a certain amenity this creates a case. The property responds to the live chats through GXP also.

So essentially the app checkout and the live chat are all on the same platform. Although as others have noted this is quite stand alone to the PMS system. Some properties are much better than others with checking GXP.

As a side note any corporate created feedback or cases also are managed through this system.