Re: [w3c/payment-handler] Specify just-in-time installation behavior? (#346)

I think the precise definition of the pre-conditions and the algorithm of auto-installation is very important for developers and vendors of the Payment Apps (PHs). Currently, the feature is available in Google Chrome, but it's a proprietary solution to Chrome and details of the pre-conditions or algorithm are not described in any specification. If other browsers e.g. Mozilla Firefox would start featuring auto-installation of PH without common specification that might lead to unnecessary fragmentation. For developers of the Payment Apps it would be much easier to implement according to the specification rather than aligning with specific implementations.

I do recognise the challenges and concerns mentioned above, but I bet there is a way to spec out the common model that would be acceptable by the participating browser vendors.

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