As per the Google Pay help, there are no details available. Although by some of the resources on internet, international payment can be done through Gpay although I would recommend you to confirm the information by contacting the Gpay customer care number which is stated below 1-800-419-0157.

To know more you may follow the link below:

https://www.google.com/intl/en_in/contact/grievance-officer.html#:~:text=(a)%20For%20GPay&text=%2D%20Google%20Pay%20India%20Grievance%20Center,%2D800%2D419%2D0157.

I hope this answer helps. All the very best for your future endeavors!