Versa can integrate with various shipping carriers such as Fedex, UPS, USPS through Stamps.com and many other carriers.
This allow you to ship orders in the application and obtain shipping labels and tracking information. Shipping information is also sent back to your e-commerce channels if you have an integration set up.
You would need to obtain credentials for your shipping carriers and enter the credentials in Versa Cloud.
See here on setting up UPS.
See here on setting up Fedex.