Return a list of failed apps (bug 895199)

[davidbgk]

To be discussed:

• the end-goal of that API, who will consume it and how?
• the potential split of transaction failures vs. statuses failures
• the structure/content of information returned
• the use of a REST framework vs. a services' function-based view

[wraithan]

r+ thanks for breaking out the tests and limiting the try/except scope!

[wraithan]

1. Marketplace consumes the api however we want it to.
2. When in doubt, make them two different statuses and we can later merge them.
3. Up to you, current format looks fine.
4. DRF lets us use function based views as part of a rest framework, you did that, I like it.

[andymckay]

transaction_* is tedious, would {'product_id', 'transaction': {'id': '..'}, 'status': {'id': '..'}} be nicer?

[wraithan]

r+