Re: [w3c/payment-handler] registration paymentManager instruments .set 'instrument-key' handler payment (Issue #410)

Hi there; thanks for filing the issue. Unfortunately `PaymentManager.Instruments` has been removed from the Payment Handler specification (https://github.com/w3c/payment-handler/pull/409) and from Chromium as of M111 (currently in Beta, to be released to Stable in early March).

The concept of a browser-managed instruments never fully matured in the ecosystem, and instead things moved in the direction of just having a payment app which is responsible for handling whatever payment methods it wants to internally to its own logic (server and client).

The still-supported way to install such a payment app is via the JIT path that is mentioned in the spec [here](https://w3c.github.io/payment-handler/#just-in-time-registration), but which there is also a web.dev article on that may be useful - https://web.dev/setting-up-a-payment-method/

I hope that this helps!

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