[w3c/payment-handler] "Middleman Id/Commission %/Payeeer" provision (#335)

Is there a provision in this API for a PWA vendor/supplier to identify (a (pre)registered relationship) with a Payment Handler in order to charge commission and/or a flat fee for a Payment Request? 

For the sake of example, let's say a much smaller version of Uber who doesn't have a direct relationship with VISA, MasterCard etc but needs to charge the User/Payer as well as the Merchant/Payee a fee for using the PWA service. IOW, the Payment Handler must split the payment to multiple payees. (Don't know if this is already happening in certain tax jurisdictions.) Super-Mini-Cabs has registered with PayPal and will accept payments via that instrument. How do they get the cut sans friction and without having to chase the merchant for it after the fact?

If not possible/legal is there a facility via the Payment Request API for adding an Item that does not further attract the Payment Handlers fees on top?  

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https://github.com/w3c/payment-handler/issues/335