Also if you notice that your address is wrong/old like I did then you can't change it on that screen, it says to "contact us" and after 15 mins of very slow support chat, I eventually was given the URL to edit my details, which I'll share here to save everyone else the time & hassle of finding it:
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[ 2.7 ms ] story [ 20.1 ms ] threadhttps://support.google.com/pay/contact/bvid_infochange