I am trying to install full version on my Father's tablet.

While downloading the trial version of solidexplorer I had used a throwaway ID (bnjhgv2@gmail.com) in playstore. Now I changed all google logins in android to the real ID (k******gal@gmail.com).

While trying to pay, the payment page is still displaying OLD THROAWAY google ID (bnjhgv2@gmail.com)

I have completely uninstalled the app and installed again and yet payment page it is NOT showing real ID.
Is there a way to change the id appearing on payment page to k******al@gmail from bnjhgv2@gmail?