If your free trial has not expired or you’ve upgraded to a paid plan, your QR Codes are scannable. But it’s most likely not scannable due to significant design changes since certain apps have more difficulties scanning more complex QR Codes.
In terms of design, note that the background and foreground colors of the Code should have sufficient contrast and the background shouldn’t be darker than the foreground (e.g. a white QR Code on a black background will not be readable by all scanners).
Also, the QR Code should be printed in the appropriate size. We recommend a minimum size of 2 x 2 cm for Dynamic Codes and 3 x 3 cm for Static Codes. Lastly, logos shouldn’t obstruct important elements of the Code.
Find out more tips and tricks in Successful Design of QR Codes.