Modification of Attendee Registration

[GoogleCodeExporter]

Summary: Throughout the year attendees regularly request upgrades, downgrades, 
and other modifications of their registration.  It would be preferred to manage 
these through SCALEReg rather than at Payflow and manually back filling data 
into SCALEReg.  While it would be ideal to allow the attendee to manager their 
own upgrades, an admin only interface would be a great improvement.

Details:  Currently there are three attendee modifications that occur 
throughout the SCALE planning cycle:
1) Upgrade (ie addition of an item/addon)
2) Download (removal of an item/addon)
3) Cancelation of registration

Each of the above actions should be available in the administrative interface 
to SCALEReg.  Upon performing those actions a refund/credit or additional 
charge should be created.  Credits/refunds are supported via PayFlow by 
referencing the original transaction ID.  Additional charges should forward the 
user or administrator to the payment interface for filling in appropriate 
payment details.

Original issue reported on code.google.com by [email protected] on 1 Aug 2011 at 8:58