Re: [Taler] Android Taler Wallet bug

[Christian Grothoff]

On 1/9/24 21:16, Marc Stibane via Taler wrote:
> > On 2024-01-09, at 20:57:20, Slack Coder <slackcoder@server.ky> wrote:
> >
> > > What problem?
> >
> > When the same fulfillment URL is used for a second order, it results in an "You've 
> > already paid for this purchase" error.  This feels unexpected because its an 
> > entirely different order.
>
>
> So, the questions are:
>
> 1) May a fulfillment URI be reused?

Yes and no.  Michael is actually preparing a tutorial explaining this 
better right now.  Short version: re-use URIs for digital goods that 
users should never buy twice and where the wallet should replay the 
previous purchase, but do NOT ever re-use URIs for physical goods.

> 2) Who emits this error - the Android app or wallet-core? In the latter case, 
> the iOS app and WebEx would show the same error…

Wallet-core. Now, we may need to improve the message shown, both for 
correct merchants (where the re-purchase should be done by wallet-core 
to get the user past the paywall) and, more tricky, for incorrect 
merchants that inappropriately re-use fulfillment URIs.

-Christian