Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WTWKN-0003RP-Eh for bitcoin-development@lists.sourceforge.net; Fri, 28 Mar 2014 12:56:07 +0000 X-ACL-Warn: Received: from wp059.webpack.hosteurope.de ([80.237.132.66]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1WTWKL-0003kt-Iw for bitcoin-development@lists.sourceforge.net; Fri, 28 Mar 2014 12:56:07 +0000 Received: from [37.143.74.116] (helo=[192.168.2.2]); authenticated by wp059.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) id 1WTWKE-0003Wg-EH; Fri, 28 Mar 2014 13:55:58 +0100 Content-Type: multipart/signed; boundary="Apple-Mail=_5F05938D-E5D9-4487-982F-5FC382551AA8"; protocol="application/pgp-signature"; micalg=pgp-sha1 Mime-Version: 1.0 (Mac OS X Mail 6.6 \(1510\)) From: Tamas Blummer In-Reply-To: Date: Fri, 28 Mar 2014 13:55:57 +0100 Message-Id: <47379042-C1B6-4E22-8FF7-4EE9FDC095AC@bitsofproof.com> References: <122FC5AD-2117-4CAF-817F-45B00F57D549@bitsofproof.com> <48ED312A-A1F9-4081-9718-04DD45804313@bitsofproof.com> To: Mike Hearn X-Mailer: Apple Mail (2.1510) X-bounce-key: webpack.hosteurope.de; tamas@bitsofproof.com; 1396011365; 8accd276; X-Spam-Score: 1.0 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 1.0 HTML_MESSAGE BODY: HTML included in message X-Headers-End: 1WTWKL-0003kt-Iw Cc: Bitcoin Dev , Andreas Schildbach Subject: Re: [Bitcoin-development] BIP 70 refund field X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Mar 2014 12:56:07 -0000 --Apple-Mail=_5F05938D-E5D9-4487-982F-5FC382551AA8 Content-Type: multipart/alternative; boundary="Apple-Mail=_8AA41925-0DA8-4D9F-9A6A-CE89780158C0" --Apple-Mail=_8AA41925-0DA8-4D9F-9A6A-CE89780158C0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 28.03.2014, at 13:27, Mike Hearn wrote: > It is not more effort than an auto remembered call-in phone number. = You delete if you do not care. The difference however is that it would = be a clean protocol for repeated payments in both directions for = whatever reason, where "refund" is and "payment" are not special = compared to "1st installment", "overpayed back" or "tip" or whatever = extra charge arises later. >=20 > I think that'd be too abstract. The purpose of the refund field is = that so if/when you receive a payment there, the wallet UI can do = something intelligent, like show you in your transactions list that a = certain payment was refunded using language the user will understand. If = it's modelled at the protocol level without that then it makes producing = good UI's harder. What is too abstract in a contact list ? If the payment comes with a tag = like refund the UI could display as such and if it comes with e.g. VAT = then that.=20 --Apple-Mail=_8AA41925-0DA8-4D9F-9A6A-CE89780158C0 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii
On 28.03.2014, at 13:27, Mike Hearn <mike@plan99.net> wrote:

It is not more effort than an auto remembered call-in phone number. You delete if you do not care. The difference however is that it would be a clean protocol for repeated payments in both directions for whatever reason, where "refund" is and "payment" are not special compared to "1st installment", "overpayed back" or "tip"  or whatever extra charge arises later.

I think that'd be too abstract. The purpose of the refund field is that so if/when you receive a payment there, the wallet UI can do something intelligent, like show you in your transactions list that a certain payment was refunded using language the user will understand. If it's modelled at the protocol level without that then it makes producing good UI's harder.

What is too abstract in a contact list ? If the payment comes with a tag like refund the UI could display as such and if it comes with e.g. VAT then that. 
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