Customer.update_subscription() resets account_balance

[gtaylor]

We're on API version 2013-07-05 with stripe 1.18.0. Here's what we can do to reproduce. This example customer has a non-zero account_balance going into this:

    customer = stripe.Customer.retrieve(
        subscription_id,
        api_key=self._api_key,
    )

    # Make the changes. The response we get back from this is missing quite
    # a bit of data, so discard it.
    customer.update_subscription(plan=plan_id, card=credit_card)

    # Re-query the customer so we can get the full, up-to-date values.
    customer = stripe.Customer.retrieve(
        subscription_id,
        api_key=self._api_key,
        expand=['default_card'],
    )

At the end of this, we end up with an account balance of 0 again. This is obviously a pretty big disruption for us. Our tests started failing within the last week, so this appears to be a recent API breakage.

[metcalf]

Greg, it looks like this may be an API bug rather than a bug in the stripe-python library. I saw that you also reported the issue to support@stripe.com and we're working with you on that thread. I'm going to close this but feel free to reopen if you believe it is in fact related to stripe-python rather than the API itself.

[metcalf]

(also, sorry for the trouble on this!)