An important feature that is absent from this product is the ability for users to easily "one-click" into their return.
Currently, users are forced to enter their order# and email address by hand for any return. This is useful in SOME use-cases but not most.
Adding parameters into the returns center url would correct this problem and create a better user experience to customers.
Using the above format as an outline, customers can now click a link from their order page / email and have all of the necessary login information pre-populated.
User Flow :
1) User clicks Return Request link
2) User is taken to Returns Center login page with order number / customer email pre-populated
3) Adding (optional) auto_login=1 to URL will submit the form on page load and attempt to log the customer into their return automatically.