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You can review from Copper Options > Credit Card Gateways > Hardware Devices >
Use this section to configure a USB credit card reader. Please be aware, currently, only some MagTek readers and generic keyboard-mode readers are supported. Copper supports USB barcode scanners, receipt printers and usb credit card readers. Many cash drawers are controlled by the receipt printer. Choose a receipt printer that works with Copper and a cash drawer that is compatible with it and works in this manner.