Bug 219254

Summary:	Update promise doesn't update the currency
Product:	WebKit	Reporter:	Dmitry Kochnev <aurokkez>
Component:	WebKit Misc.	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	aestes, p-o.blouin, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 14
Hardware:	Mac
OS:	macOS 10.15

Description Dmitry Kochnev 2020-11-23 04:50:13 PST

Hello!
According to the docs — https://www.w3.org/TR/payment-request/#paymentdetailsupdate-dictionary — I can fetch a new total (amount and currency) if I need it. But there is a problem — the sum is updated, but the currency is not, and I end up with an incorrect payment request.


Use case / steps to reproduce:
1. I call PaymentRequest.show(fetchItemsFromServer) with a stub total like { amount: "0.00", currency: "USD" }. Because of the design of my system, I need to register each payment attempt in the payment service at the moment when a user clicks on the checkout button, then the service gives me exact settings like allowed card networks, tokenization specification, total amount and currency. 
2. I fetch order items and the total from the server like { amount: "100.00", currency: "RUB" }.
3. I end up with payment request containing { amount "100.00", currency: "USD" }. The amount is received from the server, and the currency is stuck from the stub.

Exact version of safari: 14.0.1 (16610.2.11.51.8).

Comment 1 Radar WebKit Bug Importer 2020-11-30 04:51:15 PST

<rdar://problem/71802076>

Comment 2 Pierre-Olivier Blouin 2021-09-07 10:10:33 PDT

Hi!

Could we have a timeline on this or maybe if you need more details in order to fix it?

I have the exact same issue, the currency won't update when you call updateWith() with a new currency.

Thanks

Comment 3 Pierre-Olivier Blouin 2021-09-07 10:39:27 PDT

Adding to my previous comment, this makes the feature unusable for context where you land on a page that is in a certain country and then your shipping address is in a different country.

The expected behaviour would be:

PaymentRequest is initiated with the item to purchase and the currency is USD
The user initiates the Apple Pay payment, his shipping address is in Canada, then updateWith() is called and everything gets updated to CAD

Problem now, is that the payment data returned by Apple Pay is always in the first currency that was selected.

We use PayEasy to process the payment and we got this error: `Error(s) returned in Apple Pay authorize response: [{"code":"400","description":"Bad Request (95) - Invalid Currency Requested"}]`

Which makes sense because I want to purchase in CAD, but the request was encoded with USD for its currency.