The payment protocol message doesn't automatically map into a transaction.
Your node could collect several payment requests and bundle them into a single paymany transaction. This may not be included in the first iteration, but can be added later if desired. The point is that the payment requests are informational messages, not control messages.
Topic: Payment Protocol multiple outputs (Read 766 times)
Thanks, Mike.
Which version will include support for this feature ?
Next release of Bitcoin-Qt I guess, see https://bitcointalksearch.org/topic/m.3225143 
Yes. Yes. Sort of.
Which version will include support for this feature ?
Yes. Yes. Sort of.
Please correct me if I'm wrong: according to https://en.bitcoin.it/wiki/BIP_0070 it will be possible to create payment request with multiple outputs. Does it mean that I can create payment request with multiple destination wallets? If yes, will this feature be supported by the reference client? If yes, will sendmany be used to do that?
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