Return a value from Wizard 
I am writing a module for integrating a third party shipper.
Now I want before the package info is being send to the shipper to have a pop-up window where the user can check if all the fields are correct (address, name etc.). I thought of using a wizard for the purpose but the function <my_provider>_send_shipping requires to return a dict with some data which will be in the wizard.
basically I need within the send_shipping() to call a wizard, do the action and then give a return value back to send_shipping()
Or how can I achieve the goal?