Andreas' wallet supports this, but don't do it. Payment requests can get larger in future even without signing. Exploding the capacity of a QR code is very easy.

Instead, take a look at the Bluetooth/NFC discussion happening in a different thread.

On Tue, Feb 24, 2015 at 4:58 PM, Oleg Andreev <oleganza@gmail.com> wrote:
Hi,

I wonder if there is a standard way to put Payment Request data into bitcoin: URI or directly into QR code. The goal is to allow device to generate a multi-output payment request on its own, without relying on the server and x509 certificates. When scanned via QR code from, say, POS, it's pretty secure, so no additional authentication needed.

I'd like something like this:

bitcoin:?r=data://<base64url-encoded-payment-request>

If there's no standard for that, would it be a good idea to extend BIP72 this way?
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