That depends. Most systems enable a CSV export of order information that needs to be shipped.
XPS Ship will accept a CSV file and you can create labels from that.
If you want an actual integration for a system that we don't currently support, you may be able to program to our Custom API integration. This requires that your development staff conform to the specifications of our API and create the link. The Custom API is well documented but is intended only for those with software development experience.
You can also use an ODBC system to integrate with our system.