Look at Sage,Accounting.Application.License; there's CustomerEntitlement.CustomerIdentifier and SoftwareEntitlement.SoftwareSerialNumber

Yeah, you can get what you need from the class that Geoff mentioned.  if you try to go via the service then you run into problems initialising the paths.  Try this:

var licence = Sage.Accounting.Application.Licence;
SoftwareEntitlement softwareEntitlement = licence.SoftwareEntitlement;

string accountNumber = softwareEntitlement.CustomerIdentifier;
string serialNumber = softwareEntitlement.SoftwareSerialNumber;
int daysLeft = softwareEntitlement.DaysLeftUntilLicenceExpiry;

Yeah, you can get what you need from the class that Geoff mentioned.  if you try to go via the service then you run into problems initialising the paths.  Try this:

var licence = Sage.Accounting.Application.Licence;
SoftwareEntitlement softwareEntitlement = licence.SoftwareEntitlement;

string accountNumber = softwareEntitlement.CustomerIdentifier;
string serialNumber = softwareEntitlement.SoftwareSerialNumber;
int daysLeft = softwareEntitlement.DaysLeftUntilLicenceExpiry;

This is what I need. Thank you Chris.