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“We’ve just sent a verification code to the email you provided, please type the 4 digit code here:_ _ _ _”

It could even be 2 digits (the same 2 digits for everyone), you’re just looking to get their eyes on the email letting them know additional paid subscriptions are available on your website.

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Let's assume you purposefully crafted the email or app to break the code autofill built into iOS.

I think you'd end up confusing users. Most people will go to their email expecting to see a verification code in big bold type. If you make the code less obvious, they'll get frustrated ("I came here to get a code, why am I now doing something else?") It's awful UX at a particularly business-critical moment.

And this is all assuming Apple doesn't see through your ploy and just reject the app.

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