I found a typo in the admin pane How to use section under Shortcode. In the example for hiding the qrcode, qrcode is mispelled:
[btcpayments address="14AHD8B5eRGXV2AjXZQKWeT8xAxq7f1Bmp" qrode="false"]
It even shows up in the screenshot on the plugin page.
Had me scratching my head for a while! :)