You can use either the Shipping SOAP API or Delivery Manager to create and allocate a return.
Metapack recommends using the API.
You can use either of the following Shipping SOAP API methods because both of them allow you to create and allocate within the same call:
despatchConsignmentWithBookingCode call also allows you to generate the required labels. For more information about this, refer to Generating a return label.
For information about using Delivery Manager to create and allocate a return, refer to Generating returns labels.