Constructor
Dispose
Accept Payment
Capture Auth
Closeout
Discovery request
Key Press
Open Cash Drawer
Order Update
Payment Refund
Print Image (Bitmap)
Print Image (URL)
Print Text
Read Cart Data
Reject Payment
Reset Device
Retrieve Pending Payments
Show Payment Receipt Screen
Show Thank You Screen
Show Welcome Screen
Signature Verified
Terminal Message
Tip Adjust Auth
Transaction Start
Vault Card
Void Payment
Supports Acknowledgements
Add a new observer to the list of observers
observer to add
Get Supports Acknowledgements flag
boolean - Flag indicating if this device supports acks
Remove an observer from the list of observers
observer to remove
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Clover Device
Abstract clover device.