Webshipper provides returns in several ways.
The two primary ways are either to use the returnportal which doesn't support payments. Or through a Workflow with a return SKU number/name.
The return portal is the most popular choice for most customers. You built it exactly the way you would like and receive an iframe or a html page to integrate to the shop. With a little css you can make to to fit your site color scheme completely.
See how our customers do it:
Read more about the portal here:
With a workflow it is possible to catch an order which contains a specific SKU number eg "Returnlabel". The way it works is that you basically create a product for your shop which is nothing more than a return label and sell it just like any other products. When an order with the product is placed, then the system will automatically provide a return label for you.
See examples here
Read more here