Do Ubuntu One has an payment API,
I can integrate in my ubuntu-app(python)?
I would use it to add an easy donate dialog.
So end user can choose an default monthly donate amount, and how many months it will run for.
I has contact Canonical abort this, and Joshua Hoover reply:
Eventually we'll provide a way to do this but it's going to be further out in the future.
NB: my question/email to Canonical was only containing the first tree lines..