Hello,
For what I can see regarding the PaymentRequest Stripe feature, the main difference with Connect is the usage of different JavaScript code.
The plugin is already based on the Payment Intent system, so the plugin core already create the necessary data.
The current stripeConnect JavaScript object can support Payment Intent, Payment Method, Payment Source and Token.
So if you want to support Payment Request, it would requires new JS function in the object to have a new "mode".
Afterwards, it's the "end" view which contains the initialisation part and which could switch from "intent" to "request".
That view would also have access to the HikaShop order and Stripe Intent Object, so you would have all the necessary data for the Payment Request initialisation.
Regards,