updating App Store username/email
...is it possible to change the username/email of the App Store account? mine are no longer up to date and in this case rather triggering as it from a long time ago of which I am reminded each time it passes by...
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See this Apple article: Change your Apple ID -> Change your Apple ID - Apple Support (SG)
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support