On Tue, Jul 15, 2014 at 4:02 PM, Jeff Garzik <jgarzik@bitpay.com> wrote:

> BIP70 does not work well for unknown number of future payments of
> unknown, unpredictable value.


You can specify zero as an output value, in which case it's the same as "no
value specified". You can then just reuse the PaymentRequest until it
expires. So I think it provides the same functionality already.

Now sure, you'll get address reuse in this scenario, but that's no worse
than with an extended textual address.