Shift4 has updated i4Go to authenticate the connection between the guest's computer and the payment interface through the use of an Access Token. The i4go settings configuration must be updated to provide this access token, which is obtained from Shift4.
The following IRM versions support i4Go V2, authenticating with an Access
IRMNet 4.2.001.20 or later
IRMNet 4.3.000.13 or later
IRM Mobile 3.0.005.18 or later