If the debit card from project QUSD will be accredited with the Visa or Mastercard system, then I think that it will not be difficult to get support from the GooglePay service. Well, or develop your own mobile application with PayPass.
It is even difficult to say that it is easier and cheaper to develop your own application with the PayPass payment function or try to arrange for Google to include the QUSD card in its GooglePay service.
Here both options are very expensive in terms of finance, since it requires a large amount of time and effort