This should parse the ``signed_notice``, locate the solitude transaction ID and start a task to notify the developer. You can run this line of code: https://github.com/mozilla/webpay/blob/master/webpay/bango/views.py#L110

I just realized that the Zippy transaction API needs to accept ``external_transaction_id`` for this to work. You might want to just file a separate bug for this TODO comment :)