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GrapheneOS is not rooted. The phone not being rooted is part of the GrapheneOS' security model.

I assume the issue is it failing the deeper play integrity check which is about it not being "Google approved."

It isn't due to the Play Integrity API. That shows a notification on GrapheneOS with a toggle for blocking it to work around it for services not enforcing providing a result. If that was the issue, the original poster would have known from the notification. The issue ended up being PayPal shipping incorrect anti-tampering code incompatible with secure spawning. The original poster figured that out and got it working by disabling the per-app secure spawning toggle.

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